USER GUIDE FOR MODBUS REMOTE IO MODULE STHM-MBIO

STHM-MBIO-MN-EN-01 

JUN-2020

This document is applied for the following products

SKU STHM-MBIO HW Ver. 1.0 FW Ver. 1.0
Item Code

STHM-MBIO-4AI4DI4RL-NR RS485/ModbusRTU Remote I/O Module, 4AI/DI, 4DI, 4xRelay, 1xPulse Output, Non-ROHS
   

1. Functions Change Log

HW Ver. FW Ver. Release Date Functions Change
1.0 1.0 JUN-2020

 

     

 

2. Introduction

STHM-MBIO is Modbus RTU Remote IO Module to help PLC/SCADA/BMS and any IoTs gateway extend the number of I/O capabilities. STHM-MBIO has a simple but powerful design with 4 AI/DI, 4 DI, 4 Relay, 1 Pulse PWM output, 1 RS485 Master ModbusRTU and 2 RS485 Slave ModbusRTU allow them to connect to more devices such as sensors, meters, … directly and easily. The module with advanced technology provide high stability and reliability, multiple functions and easy installation with DIN rail design. The module can be used in many applications such as machine monitoring, manufacture monitoring, environmental monitoring, smart farms, etc.

STHM-MBIO-H1.png

3. Specification

Digital Inputs 04 x Ports, opto-coupler, 4.7 kohms input resisrtance, 5000V rms isolation, Logic 0 (0-1VDC), Logic 1 (5-24VDC), Functions: logic status 0/1 or Pulse counting (32 bit counter with max 4kHz pulse)
Analog Inputs 04 x Ports, select between 0-10VDC input or 0-20mA input, 12 bit Resolution, can be configured as Digital input by DIP switch (max 10VDC input)
Relay Output 04 x Ports, electro-mechanical Relays, SPDT, contact rating 24VDC/2A or 250VAC/5A, LED indicators, Latch control enable
Pulse Output 01 x Ports, open-collector, opto-isolation, max 10mA and 80VDC, On/off control, Pulser (max 2.5Khz, max 65535 Pulses) or PWM (max 2.5Khz)
Communication 02 x ModbusRTU-Slave, 01 x ModbusRTU-Master, RS485, speed 9600 or 19200, LED indicator
Reset button For resetting 02 x RS485 Slave port to default setting (9600, None parity, 8 bit)
Power supply 9..36VDC
Consumption 80mA @ 24VDC supply
Mounting type DIN rail
Terminal Block pitch 5.0mm, rating 300VAC, wire size 12-24AWG
Working temperature/humidity 0..60 degC / 95%RH non-condensing
Dimension H87xW117xD42
Net weight 80 grams

4. Applications

STHM-MBIO-H1.png STHM-MBIO-H2.png
STHM-MBIO-H3.png STHM-MBIO-H4.png
STHM-MBIO-H5.png STHM-MBIO-H6.png

5. Operation Principle

STHM-MBIO-H7.png

5.1 Modbus communication

image-1591342596596.png

02 x RS485/ModbusRTU-Slave

Protocol: Modbus RTU

Address: 1 - 247, 0 is the Broadcast address

Baud rate: 9600 , 19200

Parity: none, odd, even

Default configuration: Address: 1, Baudrate slave 1: 9600, Parity slave 1: none, Baudrate slave 2: 9600, Parity slave 2: none

Status indicator LED:

  • Led on: modbus communication OK
  • Led blinking: received data but modbus communication incorrect, due to wrong Modbus configuration: address, baudrate
  • Led off: STHM-MBIO received no data, check the connection
Memmap resgisters

READ uses function 03, WRITE uses function 16

Modbus
Register
Hex Addr # of Registers Description Range Default Format Properties Comments
Data zone
0 0 2 device info   IOMD string Read  
2 2 4 firmware version   1.0 string Read  
6 6 2 hardware version   1.1 string Read  
8 8 1 DI1___DI2: digital status 0-1   uint8 Read H_byte: DI1
L_byte: DI2
9 9 1 DI3___DI4: digital status 0-1   uint8 Read H_byte: DI3
L_byte: DI4
10 A 1 AI1___AI2: digital status 0-1   uint8 Read H_byte: AI1
L_byte: AI2
11 B 1 AI3___AI4: digital status 0-1   uint8 Read H_byte: AI3
L_byte: AI4
12 C 1 AI1: analog value     uint16 Read  
13 D 1 AI2: analog value     uint16 Read  
14 E 1 AI3: analog value     uint16 Read  
15 F 1 AI4: analog value     uint16 Read  
16 10 2 AI1: scaled value     float Read  
18 12 2 AI2: scaled value     float Read  
20 14 2 AI3: scaled value     float Read  
22 16 2 AI4: scaled value     float Read  
24 18 1 relay 1 0-1   uint16 Read/Write  
25 19 1 relay 2 0-1   uint16 Read/Write  
26 1A 1 relay 3 0-1   uint16 Read/Write  
27 1B 1 relay 4 0-1   uint16 Read/Write  
28 1C 1 open collector ctrl 0-3   uint16 Read/Write 0: off
1: on
2: pwm, generate pulse continuously
3: generate pulse , when there are enough pulses ctrl = 0
29 1D 1 spare          
30 1E 2 counter DI1     uint32 Read/Write counter can write, erase
32 20 2 counter DI2     uint32 Read/Write counter can write, erase
34 22 2 counter DI3     uint32 Read/Write counter can write, erase
36 24 2 counter DI4     uint32 Read/Write counter can write, erase
38 26 2 counter AI1     uint32 Read/Write counter writable, erasable, max frequency 10Hz
40 28 2 counter AI2     uint32 Read/Write counter writable, erasable, max frequency 10Hz
42 2A 2 counter AI3     uint32 Read/Write counter writable, erasable, max frequency 10Hz
44 2C 2 counter AI4     uint32 Read/Write counter writable, erasable, max frequency 10Hz
46 2E 2 DI1: time on     uint32 Read/Write sec
48 30 2 DI2: time on     uint32 Read/Write sec
50 32 2 DI3: time on     uint32 Read/Write sec
52 34 2 DI4: time on     uint32 Read/Write sec
54 36 2 AI1: time on     uint32 Read/Write sec
56 38 2 AI2: time on     uint32 Read/Write sec
58 3A 2 AI3: time on     uint32 Read/Write sec
60 3C 2 AI4: time on     uint32 Read/Write sec
62 3E 2 DI1: time off     uint32 Read/Write sec
64 40 2 DI2: time off     uint32 Read/Write sec
66 42 2 DI3: time off     uint32 Read/Write sec
68 44 2 DI4: time off     uint32 Read/Write sec
70 46 2 AI1: time off     uint32 Read/Write sec
72 48 2 AI2: time off     uint32 Read/Write sec
74 4A 2 AI3: time off     uint32 Read/Write sec
76 4C 2 AI4: time off     uint32 Read/Write sec
78 4E 50 spare          
128 80 2 none reset counter DI1     uint32 Read counter cannot be written or erased
130 82 2 none reset counter DI2     uint32 Read counter cannot be written or erased
132 84 2 none reset counter DI3     uint32 Read counter cannot be written or erased
134 86 2 none reset counter DI4     uint32 Read counter cannot be written or erased
136 88 2 none reset counter AI1     uint32 Read counter cannot be written or erased, max frequency 10Hz
138 8A 2 none reset counter AI2     uint32 Read counter cannot be written or erased, max frequency 10Hz
140 8C 2 none reset counter AI3     uint32 Read counter cannot be written or erased, max frequency 10Hz
142 8E 2 none reset counter AI4     uint32 Read counter cannot be written or erased, max frequency 10Hz
144 90 1 AI1: scaled value     uint16 Read  
145 91 1 AI2: scaled value     uint16 Read  
146 92 1 AI3: scaled value     uint16 Read  
147 93 1 AI4: scaled value     uint16 Read  
Configuration Zone
256 100 1 modbus address slave 1-247 1 uint16 Read/Write  
257 101 1 modbus baudrate slave 1 0-1 0 uint16 Read/Write 0: 9600, 1: 19200
258 102 1 modbus parity slave 1 0-2 0 uint16 Read/Write 0: none, 1: odd, 2: even
259 103 9 serial number     string Read/Write(PW)  
268 10C 2 password for setting     uint32 Read/Write  
270 10E 1 counter DI1: filter time   500 uint16 Read/Write x0.1ms
271 10F 1 counter DI2: filter time   500 uint16 Read/Write x0.1ms
272 110 1 counter DI3: filter time   500 uint16 Read/Write x0.1ms
273 111 1 counter DI4: filter time   500 uint16 Read/Write x0.1ms
274 112 2 counter DI1: max number   1000000 uint32 Read/Write  
276 114 2 counter DI2: max number   1000000 uint32 Read/Write  
278 116 2 counter DI3: max number   1000000 uint32 Read/Write  
280 118 2 counter DI4: max number   1000000 uint32 Read/Write  
282 11A 1 counter DI: power on reset   0 uint16 Read/Write bit 0: DI1 (0: not reset, 1: reset)
bit 1: DI2
bit 2: DI3
bit 3: DI4
283 11B 1 counter AI1: threshold logic 0   500 uint16 Read/Write  
284 11C 1 counter AI1: threshold logic 1   1800 uint16 Read/Write  
285 11D 1 counter AI2: threshold logic 0   500 uint16 Read/Write  
286 11E 1 counter AI2: threshold logic 1   1800 uint16 Read/Write  
287 11F 1 counter AI3: threshold logic 0   500 uint16 Read/Write  
288 120 1 counter AI3: threshold logic 1   1800 uint16 Read/Write  
289 121 1 counter AI4: threshold logic 0   500 uint16 Read/Write  
290 122 1 counter AI4: threshold logic 1   1800 uint16 Read/Write  
291 123 2 counter AI1: max number   1000000 uint32 Read/Write  
293 125 2 counter AI2: max number   1000000 uint32 Read/Write  
295 127 2 counter AI3: max number   1000000 uint32 Read/Write  
297 129 2 counter AI4: max number   1000000 uint32 Read/Write  
299 12B 1 counter AI: power on reset   0 uint16 Read/Write bit 0: AI1 (0: not reset, 1: reset)
bit 1: AI2
bit 2: AI3
bit 3: AI4
300 12C 1 AI1: scale in 1     uint16 Read/Write  
301 12D 1 AI1: scale in 2     uint16 Read/Write  
302 12E 2 AI1: scale out 1     float Read/Write  
304 130 2 AI1: scale out 2     float Read/Write  
306 132 1 AI2: scale in 1     uint16 Read/Write  
307 133 1 AI2: scale in 2     uint16 Read/Write  
308 134 2 AI2: scale out 1     float Read/Write  
310 136 2 AI2: scale out 2     float Read/Write  
312 138 1 AI3: scale in 1     uint16 Read/Write  
313 139 1 AI3: scale in 2     uint16 Read/Write  
314 13A 2 AI3: scale out 1     float Read/Write  
316 13C 2 AI3: scale out 2     float Read/Write  
318 13E 1 AI4: scale in 1     uint16 Read/Write  
319 13F 1 AI4: scale in 2     uint16 Read/Write  
320 140 2 AI4: scale out 1     float Read/Write  
322 142 2 AI4: scale out 2     float Read/Write  
324 144 2 AI1: cut off   0 float Read/Write  
326 146 2 AI2: cut off   0 float Read/Write  
328 148 2 AI3: cut off   0 float Read/Write  
330 14A 2 AI4: cut off   0 float Read/Write  
332 14C 1 relay 1 default 0-2 0 uint16 Read/Write 0: off, 1: on, 2: old status
333 14D 1 relay 2 default 0-2 0 uint16 Read/Write 0: off, 1: on, 2: old status
334 14E 1 relay 3 default 0-2 0 uint16 Read/Write 0: off, 1: on, 2: old status
335 14F 1 relay 4 default 0-2 0 uint16 Read/Write 0: off, 1: on, 2: old status
336 150 1 modbus baudrate slave 2 0-1 0 uint16 Read/Write 0: 9600, 1: 19200
337 151 1 modbus parity slave 2 0-2 0 uint16 Read/Write 0: none, 1: odd, 2: even
338 152 24 spare          
362 16A 1 open collector: time on     uint16 Read/Write x0.1 ms
363 16B 1 open collector: time cycle     uint16 Read/Write x0.1 ms
364 16C 2 open collector: pulse number     uint32 Read/Write  

5.2 Reset Button

When holding the reset button for 4 seconds, STHM-MBIO will reset the default configuration to 02 x RS485 / Modbus RTU-Slave.

Default Modbus RTU Configuration:

  • Address: 1
  • Baud Rate: 9600
  • Parity: none

5.3 Digital Input

image-1591342634783.png

Specification:

  • 04 channels DI, isolated
  • Input Resistance: 4.7 kΏ
  • Isolation Voltage: 5000Vrms
  • Logic level 0: 0-1V
  • Logic level 1: 5-24V
  • Function:
    • Read logic 0/1
    • Pulse Counter

5.3.1 Read the logical state 0/1

Logic value in Modbus Memory Map: 0-1

Registers to store logic values in the Modbus Memory Map:

  • DI1__DI2: digital status: stores the logical state of channel 1 and channel 2.
    • H_byte: DI1
    • L_byte: DI2
  • DI3__DI4: digital status: store the logical state of channel 3 and channel 4.
    • H_byte: DI3
    • L_byte: DI4

5.3.2 Pulse Counter

Counter value in Modbus Memory Map, when adding the number exceeds the threshold, it will automatically return: 0 - 4294967295 (32bits)

The register that stores Counter value in the Modbus Memory Map can be erased:

  • Counter DI1: stores the logic state of channel 1
  • Counter DI2: stores the logic state of channel 2
  • Counter DI3: stores the logic state of channel 3
  • Counter DI4: stores the logic state of channel 4

The register that stores Counter value in the Modbus Memory Map cannot be erased:

  • None reset counter DI1: stores the logic state of channel 1
  • None reset counter DI2: stores the logic state of channel 2
  • None reset counter DI3: stores the logic state of channel 3
  • None reset counter DI4: stores the logic state of channel 4

Configura max number:

  • "counter DI1: max number" : Count limit of counter, when counting to max value, counter will return to 0
  • "counter DI2: max number" : Count limit of counter, when counting to max value, counter will return to 0
  • "counter DI3: max number" : Count limit of counter, when counting to max value, counter will return to 0
  • "counter DI4: max number" : Count limit of counter, when counting to max value, counter will return to 0

Pulse Counter Mode:

Low-speed pulse count less than 10Hz with filter, anti-jamming:

  • Set register "counter DI1: filter time" = 500-2000: Channel 1 counts pulses less than 10Hz
  • Set register "counter DI2: filter time" = 500-2000: Channel 2 counts pulses less than 10Hz
  • Set register "counter DI3: filter time" = 500-2000: Channel 3 counts pulses less than 10Hz
  • Set register "counter DI4: filter time" = 500-2000: Channel 4 counts pulses less than 10Hz

High-speed pulse count with max 2KHz frequency without filter:

  • Set register "counter DI1: filter time" = 1: channel 1 counts pulses with Fmax = 2kHz
  • Set register "counter DI2: filter time" = 1: channel 2 counts pulses with Fmax = 2kHz
  • Set register "counter DI3: filter time" = 1: channel 3 counts pulses with Fmax = 2kHz
  • Set register "counter DI4: filter time" = 1: channel 4 counts pulses with Fmax = 2kHz

5.3.3 Time on - Time off

Time on

DI1: time on = Total time DI1 at logic 1

DI2: time on = Total time DI2 at logic 1

DI3: time on = Total time DI3 at logic 1

DI4: time on = Total time DI4 at logic 1

Time off

DI1: time off = Total time DI1 at logic 0

DI2: time off = Total time DI2 at logic 0

DI3: time off = Total time DI3 at logic 0

DI4: time off = Total time DI4 at logic 0

5.4 Analog Input

image-1591342412832.png

04 AI channels, no isolation

Use DIP SW to configure Analog input: 0-10V, 0-20mA

 

sw.png

Value Type of AI
0

0-10 V

1

0-20 mA

Input type:

  • Measure voltage: 0-10V
  • Measure current: 0-20mA
  • The configuration for AI reads the same logical state as DI, but it is not isolated with a pulse range of 0-24V

Input impedance:

  • Measure voltage: 320 kΏ
  • Measure the current: 499 Ώ

5.4.1 Read the Analog value

Resolution 12 bits

Non-Linearity: 0.1%

Analog value in Modbus Memory Map: 0-3900

Analog value register in the Modbus Memory Map:

  • AI1 analog value: store the Analog value of channel 1
  • AI2 analog value: stores the Analog value of channel 2
  • AI3 analog value: store the Analog value of channel 3
  • AI4 analog value: store the Analog value of channel 4

5.4.2 AI configuration works as DI

No isolation

AI Configure AI to read the same logic state as DI with pulse amplitude from 0-24V

There are 2 counter threshold AIx: logic threshold 0 and counter AIx: threshold logic 1 in the modbus table: 0-4095

  • Analog Analog value of AI <counter AIx: threshold logic 0: is considered Logic 0 status of AI
  • Analog Analog value of AI> counter AIx: threshold logic 1: is considered to be Logic 1 state of AI
  • Counter AIx: threshold logic 0 = <Analog value of AI <= counter AIx: threshold logic 1: is considered to be the constant logic state

Logic Logical status value of AI in Modbus Memory Map table: 0-1

The register stores logical values ​​in Modbus Memory Map:

  • AI1___AI2: digital status: stores the logical state of channel 1 and channel 2.
      • H_byte: AI1
      • L_byte: AI2
  • AI3___AI4: digital status: stores the logical state of channel 1 and channel 2.
      • H_byte: AI3
      • L_byte: AI4

5.4.3 Pulse Counter AI max 10Hz

Counter value in Modbus Memory Map, when adding the number beyond the threshold, it will automatically return: 0 - 4294967295 (32bits)

The register that stores Counter value in the Modbus Memory Map can be erased:

  • Counter AI1: stores the logic state of channel 1
  • Counter AI2: stores the logic state of channel 2
  • Counter AI3: stores the logic state of channel 3
  • Counter AI4: stores the logic state of channel 4

The register that stores Counter value in the Modbus Memory Map cannot be erased:

  • None reset counter AI1: stores the logic state of channel 1
  • None reset counter AI2: stores the logic state of channel 2
  • None reset counter AI3: stores the logic state of channel 3
  • None reset counter AI4: stores the logic state of channel 4

Configura max number:

  • "counter AI1: max number" : Count limit of counter, when counting to max value, counter will return to 0
  • "counter AI2: max number" : Count limit of counter, when counting to max value, counter will return to 0
  • "counter AI3: max number" : Count limit of counter, when counting to max value, counter will return to 0
  • "counter AI4: max number" : Count limit of counter, when counting to max value, counter will return to 0

5.4.3 Time on - Time off

Time on

AI1: time on = Total time AI1 at logic 1

AI2: time on = Total time AI2 at logic 1

AI3: time on = Total time AI3 at logic 1

AI4: time on = Total time AI4 at logic 1

Time off

AI1: time off = Total time AI1 at logic 0

AI2: time off = Total time AI2 at logic 0

AI3: time off = Total time AI3 at logic 0

AI4: time off = Total time AI4 at logic 0

5.5 Relay

image-1591341815045.png

04 channel Relay SPDT NO / NC

Contact rating: 2A / 24VDC, 0.5A / 220VAC

There are status LEDs:

  • Led on: Close Contact
  • Led off: Open Contact

Set the "relay x" register in the Modbus Memory Map table to control Relay Close / Open Contact:

Relay Set Relay Register Status of relays
Channel 1

1 Close Contact
0 Open Contact
Channel 2

1 Close Contact
0 Open Contact
Channel 3

1 Close Contact
0 Open Contact
Channel 4

1 Close Contact
0 Open Contact

Relay has 2 modes: 

  • Latch Mode
  • Normal Mode

5.5.1 Latch Mode of Relay

The relay will remember the previous Close / Open Contact status, when resetting or losing power:

Relay Channel Relay Register Set Relay Register Description
Channel 1

relay default 1 2 Relay channel 1 remembers the previous Close / Open Contact status
0/1 Relay channel 1 status does not remember the Close / Open Contact
Channel 2

relay default 2 2 Relay channel 2 remembers the previous Close / Open Contact status
0/1 Relay channel 2 status does not remember the Close / Open Contact
Channel 3

relay default 3 2 Relay channel 3 remembers the previous Close / Open Contact status
0/1 Relay channel 3 status does not remember the Close / Open Contact
Channel 4

relay default 4 2 Relay channel 4 remembers the previous Close / Open Contact status
0/1 Relay channel 4 status does not remember the Close / Open Contact

5.5.2 Normal Mode of Relay

Relay operates normally, do not remember the status of Close / Open Contact when power reset or power failure. Relay status table when resetting the power as follows:

Register Default Relay Status of relays when resetting power
0 Open Contact
1 Close Contact
2 Remember the previous state (Latch mode)

5.6 Pulse Output

image-1591341459629.png

01 isolated open-collector channel

Opto-coupler: Source current Imax = 10mA, Vceo = 80V

Functions: On / Off, pulse generator, PWM

5.6.1 On/Off Function

Set the Open-collector register in the Modbus Memory Map table:

  • Set Open-collector register: 1 => Pulse Output ON
  • Set Open-collector register: 0 => Pulse Output OFF

5.6.2 Pulse generator

Pulse output transmits a maximum of 65535 pulses, with Fmax 2.5kHz

Configure the following registers in the Modbus Memory Map table:

  • Set register "open collector: pulse number": 0-65535 => Pulse Number = 65535: broadcast 65535 pulses
  • Set register "open collector: time cycle": (0-65535) x0.1ms => Time Cycle = 4: Fmax 2.5kHz
  • Set register "open collector: time on": (0-65535) x0.1ms => Time On: is the logic time 1 of the pulse
  • Set the register "open collector ctrl" = 3 => configure the Pulse Output to generate a pulse and start to pulse, generate a sufficient number of pulses in the "open collector: pulse number" register => stop pulse generator and register " open collector ctrl ”= 0

5.6.3 PWM

Max frequency 2.5kHz

Configure the following registers in the Modbus Memory Map table:

  • Set the register "open collector ctrl" = 2 => configure Pulse Output PWM function
  • Set register "open collector: time cycle": (0-65535) x0.1ms => Time Cycle = 4: Fmax 2.5kHz
  • Set register "open collector: time on": (0-65535) x0.1ms => Time On: is the logic time 1 of the pulse

6. Installation

Mounting type: DIN rail

DSC_0134.png

7. Troubleshooting

No. Phenomena Reason Solutions
1 Modbus failed to communicate

Modbus LED Status:

  • LED is off: received no data
  • LED is blinking: the Modbus configuration is not the correct 
  • Check the connection
  • Check the Modbus configuration: Address, Baud Rate, Parity
2 Timeout Modbus Noise appears on the line Configure Baudrate 9600 and use a twisted pair cable with anti-jamming protection

8. Support contacts

Manufacturer

Daviteq Technologies Inc

logo-01.png

No.11 Street 2G, Nam Hung Vuong Res., An Lac Ward, Binh Tan Dist., Ho Chi Minh City, Vietnam.
Tel: +84-28-6268.2523/4 (ext.122)

Email: info@daviteq.com | www.daviteq.com