SLM-AI-8-V

SLM-AI-8-V

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

Specifications:
Download SLM-AI-8-V Datasheet

Description

• 8-channel 0-10V input module.

• 13-bit Resolution for precision control

• Designed for industrial control applications.

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Configuration

Channel Select

Enable or disable the channels to be read. The first channel cannot be disabled.

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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	30001	Read-Only	Input Register	16-bit
Ch2	30002	Read-Only	Input Register	16-bit
Ch3	30003	Read-Only	Input Register	16-bit
Ch4	30004	Read-Only	Input Register	16-bit
Ch5	30005	Read-Only	Input Register	16-bit
Ch6	30006	Read-Only	Input Register	16-bit
Ch7	30007	Read-Only	Input Register	16-bit
Ch8	30008	Read-Only	Input Register	16-bit

Notes:

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

• 0-10V inputs* are read-only and mapped to Modbus Input Registers (30001 - 30008).

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Status Register Mapping

Note: The status registers are read-only booleans and are mapped to Discrete Input Status registers (101001 - 101018).

Status	Modbus Register	Access	Register Type	Data Length
Module diagnostics failure	101001	Read-Only	Discrete Input Status	1-bit
24V Missing	101002	Read-Only	Discrete Input Status	1-bit
Ch1 Under Range	101003	Read-Only	Discrete Input Status	1-bit
Ch2 Under Range	101004	Read-Only	Discrete Input Status	1-bit
Ch3 Under Range	101005	Read-Only	Discrete Input Status	1-bit
Ch4 Under Range	101006	Read-Only	Discrete Input Status	1-bit
Ch5 Under Range	101007	Read-Only	Discrete Input Status	1-bit
Ch6 Under Range	101008	Read-Only	Discrete Input Status	1-bit
Ch7 Under Range	101009	Read-Only	Discrete Input Status	1-bit
Ch8 Under Range	101010	Read-Only	Discrete Input Status	1-bit
Ch1 Over Range	101011	Read-Only	Discrete Input Status	1-bit
Ch2 Over Range	101012	Read-Only	Discrete Input Status	1-bit
Ch3 Over Range	101013	Read-Only	Discrete Input Status	1-bit
Ch4 Over Range	101014	Read-Only	Discrete Input Status	1-bit
Ch5 Over Range	101015	Read-Only	Discrete Input Status	1-bit
Ch6 Over Range	101016	Read-Only	Discrete Input Status	1-bit
Ch7 Over Range	101017	Read-Only	Discrete Input Status	1-bit
Ch8 Over Range	101018	Read-Only	Discrete Input Status	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)

while True:
    ch_raw = client.read_input_registers(0, 2)
    # Convert 0-8191 to 0-10V
    # Outputs as integer 0-8191 so simple conversion to float is possible
    ch1_V = ch_raw[0] * (10 / 8192)
    ch2_V = ch_raw[1] * (10 / 8192)
    print(f"Channel 1 Raw: {ch_raw[0]} V")
    print(f"Channel 2 V: {ch2_V} V")
    time.sleep(1)

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

// arduino code here
#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 input registers
int numInputs = 1;         // The number of input registers to read (0-7)

void setup() {
    # Setup modbus client
}

void loop() {
    float voltageInput_v = readVoltageInput();
    Serial.println(voltageInput_v);
    delay(1000);
}

float readVoltageInput() {
  ModbusRTUClient.requestFrom(slaveId, INPUT_REGISTERS, startAddress, numInputs);
  int16_t voltageInput = ModbusRTUClient.read();
  float voltageInput_v = voltageInput * (10 / 8192);
  return voltageInput_v;
}

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
    AI1 AT %IW0 : WORD;
    AI2 AT %IW1 : WORD;
    AI3 AT %IW2 : WORD;
    AI4 AT %IW3 : WORD;
    AI5 AT %IW4 : WORD;
    AI6 AT %IW5 : WORD;
    AI7 AT %IW6 : WORD;
    AI8 AT %IW7 : 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
AI1	Integer, 16 Bit
AI2	Integer, 16 Bit
AI3	Integer, 16 Bit
AI4	Integer, 16 Bit
AI5	Integer, 16 Bit
AI6	Integer, 16 Bit
AI7	Integer, 16 Bit
AI8	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-AI-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.