Modbus - D/A converter

Deze Chinese D/A converter komt in meerdere modellen voor, zoals: EM4AO, HSA4O, HY4AO, etc.

Ingangsspanning is 10V met een modbus protocol kan je 4 analoge kanalen instellen van 0 ~ 10V (20mA) in 4096 stappen (12 bit).

Info (ENG)

Product Overview

EM4AO type 4 way analog isolated output module is a universal remote I/O product in automation system. It realizes the control of 4 way analog output by RS485 communication interface.

This module for the whole industrial design, power supply, analog output, RS485 interface implementation in electrical isolated, effectively inhibit the industrial field of various string and common mode interference, to ensure the reliability and accuracy of the data. The RS485 communication interface implements the MODBUS RTU protocol, and can directly connect all kinds of PLC, DCS systems, man-machine screens and configuration software.

Product Features

4 analog output isolation, support 0 ~ 20mA, 4 ~ 20mA, 0 ~ 5V, 1 ~ 5V, 0 ~ 10V format
12-bit resolution, accuracy is better than ± 0.1%
built-in keep the timer, improve the security of the control system
use the write register to achieve the way the current channel and voltage channel configuration, without opening jumper settings
full industrial design, power supply, communication, analog output isolated from each other
With hardware to restore the communication parameters of the factory configuration function
MODBUS RTU communication protocol
DC10 ~ 30V wide range of power input
maximum power consumption is only 4W

Specifications

Current output

Voltage output

4 current output, 12 bit resolution, accuracy + 0.1%, 0~20mA/4~20mA format

4 current output, 12 bit resolution, accuracy + 0.1%, 0~5V/1~5V/0~10V/2~10V format

The writing register is used to realize the configuration of the current channel and the voltage channel without setting up the jumper wire setting

Refresh cycle 2ms

Built in hold time timer, holding time constant 0~60.00s

Electrical isolation: 1500V (customizable 3000V)

communication interface

Physical type: RS485

Communication protocol: MODBUS RTU

Communication rates: 1200, 2400, 4800, 9600, 19200bps

With hardware force recovery, communication parameters, factory configuration function

Electrical isolation: 1500V (customizable 3000V)

Power input

Nominal power supply: DC24V

Input range: DC10~30V

Power consumption: less than 4W

Protection function: anti reverse, anti surge

module structure

Configuration: Adam module, 10+10 bit pluggable terminals

Installation: DIN rail installation

Outline size

Module parts: 104mm * 72mm * 26mm (excluding terminals and guide block)

Max size: 124mm * 72mm * 45mm (including terminal and guide block)

work environment

Operating temperature: -25 ~ +85 DEG C

Ambient humidity: 10~90%RH (without dew)

Pinout

terminal	Code	Name
1	AO3/I+	Analog output 3 current channel
2	AO3/U+	Analog output 3 voltage channel
3	AOCOM	Analog output common end
4
5
6
7	485A	RS485 DATA A
8	485B	RS485 DATA B
9	VIN+	Power +
10	VIN-	Power –
11	AO0/I+	Analog output 0 current channel
12	AO0/U+	Analog output 0 voltage channel
13	AOCOM	Analog output common end
14	AO1/I+	Analog output 1 current channel
15	AO1/U+	Analog output 1 voltage channel
16	AOCOM	Analog output common end
17	AO2/I+	Analog output 2 current channel
18	AO2/U+	Analog output 2 voltage channel
19	AOCOM	Analog output common end
20

Overige info

Indicating lamp

Indicator light	Name	Color	Explain
PWR	Power indication	Green	Slow flashing: power up, Chang Liang: ready, flash: restore communication parameters
TXD	Data sending	Red	send data
RXD	Data reception	Yellow	receive data

Force recovery communication parameters, factory configuration

When the communication parameters are forgotten or the communication parameters are changed due to misoperation, in addition to the configuration software search module, the factory configuration for forcing the resumption of communication parameters can also be carried out as follows:

(1) make sure that the module is powered off;

(2) open the module housing and plug in the short jumper cap on the 6 pin ISP connector P4-P6;

(3) the module is electrified, the module power lamp flashes slowly two times and then becomes flash;

(4) turn off the power supply and unplug the short jumper cap and close the module housing;

(5) the module is powered on, and the communication parameters of the module have been restored to:

Rate of communication: 9600bps

Check mode: no

Local address: 1

Warning: do not plug in short jumper cap before the module is powered down!!!

Foto’s

Mobus registers

Supported function code

Code	Meaning	operation
03H	Read multiple hold registers	Reads the values of one or more holding registers
06H	Write a single hold register	Writes a data to a hold register
10H	Write multiple hold registers	Write one or more data into a hold register
11H	Read device properties	Read slave type, status

Hold register (support function code 03H, 06H, 10H)

address	Name	Actual value range	Bit	Range		factory Default value	Read / write
40001	Communication speed	1200/2400/4800/9600/19200	Bit15~12	0,1,2,3,4	3		Read / write
	Check mode	Parity check / parity check / odd check	Bit11~8	0,1,2	0
	Native address	1~247	Bit7~0	1~247	1
40002	Device type	199		199	199		read-only
40003	Hardware version	H0.00~2.55	Bit15~8	0~255			read-only
40003	Software version	R0.00~2.55	Bit7~0	0~255			read-only
40004	Date of manufacture	year，year after 2 bits，2000~2099	Bit15~9	0~99			read-only
		month，possision 4 bit，1~12	Bit8~5	1~12
		Day，possision 5 bit，1~31	Bit4~0	1~31
40005	Production number	Production number (high byte before)		0~65535			read-only
40006	Equipment status	0 power on (self-test) /1 ready, /2 fault		0~2			read-only
40007	Retention time constant	0~60.00s^[^注^1]		0~6000	0		Read write
40008	AO0 signal format	0（0~20mA,0~10V） 1（0~20mA,0~5V） 2（4~20mA,2~10V）^[^注^2] 3（4~20mA,1~5V）^[^注^2]		0~3	0		Read write
40009	AO1 signal format			0~3	0		Read write
40010	AO2 signal format			0~3	0		Read write
40011	AO3 signal format			0~3	0		Read write
40012	AO0 preset ^[^注^3]	Analog output 0 channel		0~4095	0		Read write
40013	AO1 preset	Analog output 1 channel		0~4095	0		Read write
40014	AO2 preset	Analog output 2 channel		0~4095	0		Read write
40015	AO3 preset	Analog output 3 channel		0~4095	0		Read write
40016	AO0 given	Analog output 0 channel		0~4095	0		Read write
40017	AO1 given	Analog output 1 channel		0~4095	0		Read write
40018	AO2 given	Analog output 2 channel		0~4095	0		Read write
40019	AO3 given	Analog output 3 channel		0~4095	0		Read write

[Note 1] Output hold constant – when 0 means that each given AO output will continue until a new given value is written. For 1 to 6000 means that if the given AO output does not update the reference again when the specified hold time is reached, the AO output will return to the initial state (ie, the preset value).

[Note 2] Signal format – When the signal format is set to 2 (4 ~ 20mA, 2 ~ 10V) or 3 (4 ~ 20mA, 1 ~ 5V), the given output will not be less than 819. If a value less than 819 is given, it is still output at the given value of 819.

[Note 3] Preset value – The static value of the output of the channel when the module is powered up or when the hold time is reached.

Device attribute register (support function code 11H)

byte	Name	Actual value range	bit	range	Read write
2	Device type	199		199	read-only
2	Hardware version	H0.00~2.55	Bit15~8	0~255	read-only
2	Software version	R0.00~2.55	Bit7~0	0~255	read-only
2	Date of manufacture	year，year after 2 bits，2000~2099	Bit15~9	0~99	read-only
		month，possision 4 bits，1~12	Bit8~5	1~12
		day，possision 5 bits，1~31	Bit4~0	1~31
2	Production number	Production number (high byte before)		0~65535	read-only
2	Equipment status	0 power on (self-test) /1 ready, /2 fault		0~2	read-only

Voorbeeld uitlezen

Fabriek gegevens
Standaard adres: 1
Baud rate: 9600
Parity: None
Stopbits: 1

Standaard output is: 0 ~10V

#!/usr/bin/env python
 
# Modbus uitlezen
# Apparaat: HYA4O (DA converter)
#
# Script gemaakt door S. Ebeltjes (domoticx.nl)

from __future__ import division
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
 
from pymodbus.constants import Endian              # Nodig voor 32-bit float getallen (2 registers / 4 bytes)
from pymodbus.payload import BinaryPayloadDecoder  # Nodig voor 32-bit float getallen (2 registers / 4 bytes)
from pymodbus.payload import BinaryPayloadBuilder  # Nodig om 32-bit floats te schrijven naar register
 
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 / DA converter xxA4O"

def a0(appid, volt):
  try:
    client.write_register(15, float(4095 / 10) * volt, unit=appid)
    client.close()
    print "Register set at:", float(4095 / 10) * volt
  except:
    print "Modbus register error (a0)"
    return 0

def a1(appid, volt):
  try:
    client.write_register(16, float(4095 / 10) * volt, unit=appid)
    client.close()
    print "Register set at:", float(4095 / 10) * volt
  except:
    print "Modbus register error (a1)"
    return 0

# Zet kanaal A0 op 5.45V
a0(1, 5.45) #0-10V, decimal accepted

#!/usr/bin/env python

# Modbus uitlezen

# Apparaat: HYA4O (DA converter)

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

from __future__ import division

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

from pymodbus.constants import Endian # Nodig voor 32-bit float getallen (2 registers / 4 bytes)

from pymodbus.payload import BinaryPayloadDecoder # Nodig voor 32-bit float getallen (2 registers / 4 bytes)

from pymodbus.payload import BinaryPayloadBuilder # Nodig om 32-bit floats te schrijven naar register

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 / DA converter xxA4O"

def a0(appid, volt):

try:

client.write_register(15, float(4095 / 10) * volt, unit=appid)

client.close()

print "Register set at:", float(4095 / 10) * volt

except:

print "Modbus register error (a0)"

return 0

def a1(appid, volt):

try:

client.write_register(16, float(4095 / 10) * volt, unit=appid)

client.close()

print "Register set at:", float(4095 / 10) * volt

except:

print "Modbus register error (a1)"

return 0

# Zet kanaal A0 op 5.45V

a0(1, 5.45) #0-10V, decimal accepted

Zoeken

Modbus – D/A converter – HY4AO

Info (ENG)

Pinout

Overige info

Foto’s

Mobus registers

Voorbeeld uitlezen