SLM-AO-8-V

SLM-AO-8-V

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Channels: 8
Output Range: 0-10V
Resolution: 13-bit (0-8191)
Register Type: Analog Output/Holding Registers

Specifications:
Download SLM-AO-8-V Datasheet

Description

• 8-channel 0-10V output module.

• 13-bit Resolution for precision control

• Designed for industrial control applications.

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Configuration

Set Analog Timeout Value

During a communication failure and the watchdog timer is triggered, the module will output the value set in the Analog Timeout Value field.

See Watchdog Timer for more information.

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Modbus Mapping

Note

The following register mappings assumes that it is the only module connected. Actual mapping may vary depending on the configuration of the system.

Modbus Register Mapping

Channel	Modbus Register	Access	Register Type	Data Length
Ch1	40001	Read/Write	Holding Register	16-bit
Ch2	40002	Read/Write	Holding Register	16-bit
Ch3	40003	Read/Write	Holding Register	16-bit
Ch4	40004	Read/Write	Holding Register	16-bit
Ch5	40005	Read/Write	Holding Register	16-bit
Ch6	40006	Read/Write	Holding Register	16-bit
Ch7	40007	Read/Write	Holding Register	16-bit
Ch8	40008	Read/Write	Holding Register	16-bit

Notes:

• Each Modbus Holding Register corresponds to a single analog output channel.

• 0-10V outputs are read/write and mapped to Modbus Holding Registers (40001 - 40008).

• Values range from 0-8191 corresponding to 0-10V output.

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Status Register Mapping

Note: The status registers are read-only booleans and are mapped to Discrete Input Status registers (101001 - 101002).

Status	Modbus Register	Access	Register Type	Data Length
Module diagnostics failure	101001	Read-Only	Input Register	1-bit
24V Missing	101002	Read-Only	Input Register	1-bit

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Example Usage

Note

The following examples assume that it is the only module connected. Actual mapping may vary depending on the configuration of the system.

Python

import time
from pyModbusTCP.client import ModbusClient
import struct

client_ip = '192.168.1.255'  # Replace with your device's IP
client = ModbusClient(host=client_ip, port=502, auto_open=True)

# Convert 0-10V to 0-8191
def V_to_raw(V):
    return int(V * (8191 / 10))

# Convert 0-8191 to 0-10V
def raw_to_V(raw):
    return raw * (10 / 8191)

# Set output to 5V (mid-range)
raw_value = V_to_raw(5)
client.write_single_register(0, raw_value)

# Read current output value
current_raw = client.read_holding_registers(0, 1)[0]
current_V = raw_to_V(current_raw)
print(f"Current output: {current_V} V")

Note

This is an explanatory section on how to read/write to a module. For a more complete example using Python, visit Python Example.

Arduino

#include <ArduinoModbus.h> // Include Modbus library

// Assume ModbusRTUClient is already initialized (e.g., ModbusRTUClient.begin(...))
int slaveId = 0x01;       // The ID of the Modbus slave device
int startAddress = 0;     // The starting address of the holding registers
int numRegisters = 8;     // The number of registers to read/write

void setup() {
    # Setup modbus client
}

void loop() {
    // Convert 0-10V to 0-8191
    int rawValue = map(5, 0, 10, 0, 8191);  // Set to 5V
    
    // Write to output
    ModbusRTUClient.beginTransmission(slaveId, HOLDING_REGISTERS, startAddress, 1);
    ModbusRTUClient.write(rawValue);
    ModbusRTUClient.endTransmission();
    
    // Read current value
    ModbusRTUClient.requestFrom(slaveId, HOLDING_REGISTERS, startAddress, 1);
    int currentRaw = ModbusRTUClient.read();
    float current_V = map(currentRaw, 0, 8191, 0, 10);
    
    delay(1000);
}

Note

The above code uses the ArduinoModbus library and is not a complete program.

Note

This is an explanatory section on how to read/write to a module. For a more complete example using Arduino, visit Arduino Example.

Codesys

Under Modbus_TCP_Server -> Modbus Server Channel Under Modbus_TCP_Server -> Modbus Server Channel -> I/O Mapping Usage

VAR
    AO1 AT %QW0 : WORD;
    AO2 AT %QW1 : WORD;
    AO3 AT %QW2 : WORD;
    AO4 AT %QW3 : WORD;
    AO5 AT %QW4 : WORD;
    AO6 AT %QW5 : WORD;
    AO7 AT %QW6 : WORD;
    AO8 AT %QW7 : WORD;
END_VAR

Note

This is an explanatory section on how to read/write to a module. For a more complete example using Codesys, visit Codesys Example.

Productivity Suite

Tag

Tag Name	Type
AO1	Integer, 16 Bit
AO2	Integer, 16 Bit
AO3	Integer, 16 Bit
AO4	Integer, 16 Bit
AO5	Integer, 16 Bit
AO6	Integer, 16 Bit
AO7	Integer, 16 Bit
AO8	Integer, 16 Bit

Usage

Note

This is an explanatory section on how to read/write to a module. For a more complete example using Productivity Suite, visit Productivity Suite Example.

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Specifications

Download SLM-AO-8-V Datasheet

Safety Precautions

• Do not add or remove modules while field power is applied.

• Ensure proper grounding and wire connections to prevent electrical hazards.

• Follow all local and national electrical codes.

• Maintain adequate ventilation to prevent overheating.

For more details and technical support, visit Synergy Logic or contact support@synergy-logic.com.