Modbus - Relaisbord

Hardware

BESTELLEN

Wellicht ken je deze boards wel voor de microcontroller, daar worden ze geschakeld via een hoog/laag signaal, dit board is geschikt om via modbus RS485 aan te sturen.

Technische Specificaties (ENG)

DC 12V power supply (voltage range 9-13V )
Standby current (all relays closed) 12MA, 1 relay open 40MA, 2 relays open 67MA, 3 relays open 95MA,4 relays open 121MA,5 relays open 147MA,6 relays open 173MA, 7 relays open 198MA,8 relays open 223MA
“open” “close” “Momentary” “Self-locking” “Interlock” “Delay” 6 Commands
MODBUS RTU command
Under the “Delay” command ,the maximum delay is 255 seconds
MODBUS commands can be made serial HyperTerminal (serial assistant) OR “Modbus Poll” Enter;
Under the MODBUS command mode, it can support up to 64 devices in parallel
Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC

Standaard modbus instellingen

9600 Band
8 Data bits
None Parity
1 Stop Bit

Instellen van het mobus adres:

Het instellen van een adres van dit relaisbord (4 kanaals) gebeurt met DIP switch A0-4 (5 bit), hiermee zijn 32 adressen mogelijk:

Met DIP 6 (A5) stel je het modbus/AT commando instelling in

A5 uit = AT commando
A5 aan = Modbus RTU

Let op: Bij gebruik van het 8x relais bord hebben wij geconstateerd dat DIP 6 (A5) naar beneden (uit) moet staan voor modbus!

Mobus registers

MODBUS 06 Command (Control command ,HEX):

Bytes Number	1	2	3	4	5	6	7	8
MODBUS Definitions	Slave ID	Function	Address		Data		CRC Check
Function	Device Address	Function	Channel number		Command	Delay time	CRC Check
Open	0x00-0x2F	0x06	0x0001- 0x0008		0x01	0x00	2Bytes CRC
Close	0x00-0x2F	0x06	0x0001- 0x0008		0x02	0x00	2Bytes CRC
Toggle (Self-locking)	0x00-0x2F	0x06	0x0001- 0x0008		0x03	0x00	2Bytes CRC
Latch (Inter-locking)	0x00-0x2F	0x06	0x0001- 0x0008		0x04	0x00	2Bytes CRC
Momentary (Non-locking)	0x00-0x2F	0x06	0x0001- 0x0008		0x05	0x00	2Bytes CRC
Delay	0x00-0x2F	0x06	0x0001- 0x0008		0x06	0x00-0xff	2Bytes CRC

Remarks:

Momentary mode, delay time is 1 seconds
Delay mode, delay time is 0-255 seconds

Return command:

Command is active, return to send commands; instruction is invalid no return.

MODBUS 03 Command (Read status command ,HEX):

Bytes Number	1	2	3	4	5	6	7	8
MODBUS Definitions	Slave ID	Function	Address		Data		CRC Check
Function	Device Address	Function	Starting register address		Register length		CRC Check
Read Channel 1 State	0x00-0x2F	0x03	0x0001		0x0001
Read Channel 2 State	0x00-0x2F	0x03	0x0002		0x0001
Read 2 consecutive channels status	0x00-0x2F	0x03	0x0001-0x0003		0x0002
Read 3 consecutive channels status	0x00-0x2F	0x03	0x0001-0x0002		0x0003
Read all 8 channels status	0x00-0x2F	0x03	0x0001		0x0008

Read status command returns (function code 03, HEX format):

Bytes length	1	1	1		2
MODBUS Definitions	Slave ID	Function	data length	data	CRC16 Check
Function	Device Address	Function	data length	Relay state 0x0001 open 0x0000 close	CRC16 Check
Channel 1 open	0x00-0x1F	0x03	0x02	0x0001
Channel 1 close	0x00-0x1F	0x03	0x02	0x0000
Channel 2 open	0x00-0x1F	0x03	0x02	0x0001
Channel 2 close	0x00-0x1F	0x03	0x02	0x0000
Channel 1 open Channel 2 open	0x00-0x1F	0x03	0x04	0x0001 0x0001
Channel 1 open Channel 2 close	0x00-0x1F	0x03	0x04	0x0001 0x0000
Channel 1 close Channel 2 open	0x00-0x1F	0x03	0x04	0x0000 0x0001
Channel 1 close Channel 2 close	0x00-0x1F	0x03	0x04	0x0000 0x0000

Voorbeeld schakelen (uit de handleiding)

Examples (Slave ID is 1,DIP switch state)
Channel 1 Open: 01 06 00 01 01 00 D9 9A
Channel 1 Close: 01 06 00 01 02 00 D9 6A
Channel 1 Toggle: 01 06 00 01 03 00 D8 FA
Channel 1 Latch: 01 06 00 01 04 00 DA CA
Channel 1 Momentary: 01 06 00 01 05 00 DB 5A
Channel 1 Delay 10 seconds : 01 06 00 01 06 0A 5B AD
Channel 1 Delay 100 seconds: 01 06 00 01 06 64 DA 41

Channel 2 Open: 01 06 00 02 01 00 29 9A
Channel 2 Close: 01 06 00 02 02 00 29 6A
Channel 2 Toggle: 01 06 00 02 03 00 28 FA
Channel 2 Latch: 01 06 00 02 04 00 2A CA
Channel 2 Momentary: 01 06 00 02 05 00 2B 5A
Channel 2 Delay 10 seconds: 01 06 00 02 06 0A AB AD
Channel 2 Delay 100 seconds: 01 06 00 02 06 64 2A 41

Read state (assuming that the channel 1 is open, the channel 2 is close).
Read channel 1 state: 01 03 00 01 00 01 D5 CA
Return open: 01 03 02 00 01 79 84
Read channel 2 state: 01 03 00 02 00 01 25 CA
Return close: 01 03 02 00 00 B8 44
Read channel 1 and channel 2 state: 01 03 00 01 00 02 95 CB
Return channel open and channel 2 close: 01 03 04 00 01 00 00 AB F3

Voorbeeld schakelen

#!/usr/bin/env python
 
# Modbus aansturen
# Apparaat: Relaisbord
#
# Script gemaakt door S. Ebeltjes (domoticx.nl)
 
import pymodbus
import serial
from pymodbus.pdu import ModbusRequest
from pymodbus.client.sync import ModbusSerialClient as ModbusClient #initialize a serial RTU client instance
from pymodbus.transaction import ModbusRtuFramer
 
method = "rtu"
port = "/dev/ttyUSB0"
baudrate = 9600
stopbits = 1
bytesize = 8
parity = "N"
timeout = 1
retries = 2
 
try:
  client = ModbusClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)
  connection = client.connect()
except:
  print "Modbus connectie error / Relais bord"
 
def aan1(appid):
  try:
    data = client.write_register(0x0001, 0x0100, unit=appid)
  except:
    print "Modbus register error (relais)"
    return 0

def uit1(appid):
  try:
    data = client.write_register(0x0001, 0x0200, unit=appid)
  except:
    print "Modbus register error (relais)"
    return 0
 
# Schakelen
aan1(1) #SlaveID 1, Relais 1 aan
#uit1(1) #SlaveID 1, Relais 1 uit

#!/usr/bin/env python

# Modbus aansturen

# Apparaat: Relaisbord

# Script gemaakt door S. Ebeltjes (domoticx.nl)

import pymodbus

import serial

from pymodbus.pdu import ModbusRequest

from pymodbus.client.sync import ModbusSerialClient as ModbusClient #initialize a serial RTU client instance

from pymodbus.transaction import ModbusRtuFramer

method = "rtu"

port = "/dev/ttyUSB0"

baudrate = 9600

stopbits = 1

bytesize = 8

parity = "N"

timeout = 1

retries = 2

try:

client = ModbusClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)

connection = client.connect()

except:

print "Modbus connectie error / Relais bord"

def aan1(appid):

try:

data = client.write_register(0x0001, 0x0100, unit=appid)

except:

print "Modbus register error (relais)"

return 0

def uit1(appid):

try:

data = client.write_register(0x0001, 0x0200, unit=appid)

except:

print "Modbus register error (relais)"

return 0

# Schakelen

aan1(1) #SlaveID 1, Relais 1 aan

#uit1(1) #SlaveID 1, Relais 1 uit

Voorbeeld schakelen in Python 3

#!/usr/bin/env python

# Modbus aansturen met Python 3
# Apparaat: Relaisbord
#
# Script gemaakt door S. Ebeltjes (domoticx.nl)

from pymodbus3.client.sync import ModbusSerialClient

method = "rtu"
port = "/dev/ttyUSB0"
baudrate = 9600
stopbits = 1
bytesize = 8
parity = "N"
timeout = 1
retries = 2

try:
  client = ModbusSerialClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)
except:
  print ("Modbus connectie error / Relais bord")

def aan1(appid):
  try:
    data = client.write_register(0x0001, 0x0100, unit=appid)
  except:
    print ("Modbus register error (relais)")
    return 0

def uit1(appid):
  try:
    data = client.write_register(0x0001, 0x0200, unit=appid)
  except:
    print ("Modbus register error (relais)")
    return 0

# Schakelen
aan1(1) #SlaveID 1, Relais 1 aan
#uit1(1) #SlaveID 1, Relais 1 uit

#!/usr/bin/env python

# Modbus aansturen met Python 3

# Apparaat: Relaisbord

# Script gemaakt door S. Ebeltjes (domoticx.nl)

from pymodbus3.client.sync import ModbusSerialClient

method = "rtu"

port = "/dev/ttyUSB0"

baudrate = 9600

stopbits = 1

bytesize = 8

parity = "N"

timeout = 1

retries = 2

try:

client = ModbusSerialClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)

except:

print ("Modbus connectie error / Relais bord")

def aan1(appid):

try:

data = client.write_register(0x0001, 0x0100, unit=appid)

except:

print ("Modbus register error (relais)")

return 0

def uit1(appid):

try:

data = client.write_register(0x0001, 0x0200, unit=appid)

except:

print ("Modbus register error (relais)")

return 0

# Schakelen

aan1(1) #SlaveID 1, Relais 1 aan

#uit1(1) #SlaveID 1, Relais 1 uit

[#/handleidingen/modbus_relaisbord” ]

Zoeken

Modbus – Relaisbord

Hardware

BESTELLEN

Instellen van het mobus adres:

Mobus registers

Voorbeeld schakelen (uit de handleiding)

Voorbeeld schakelen

Voorbeeld schakelen in Python 3