SLM-DCI-8NP-DCO-7N

SLM-DCI-8NP-DCO-7N

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Input Channels: 8
Discrete Input Type: Sink/Source
Rated Input Voltage: 12-24 VDC
Register Type: Discrete Input/Input Status

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Output Channels: 7
Discrete Output Type: Sink
Rated Output Voltage: 3.3-24 VDC
Register Type: Discrete Output/Coil

Specifications:
Download SLM-DCI-8NP-DCO-7N Datasheet

Description

• 8-channel 24VDC sink/source inputs and 7-channel 24VDC sinking outputs.

• Designed for industrial control applications requiring both DC input and output signals.

• Two isolated commons for flexible wiring.

• Outputs use sinking (NPN) transistor switching.

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Configuration

• No configuration required

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Modbus Mapping

Note

The following register mappings are based on a single-module configuration. Actual mappings may differ based on the physical slot arrangement in your system.

Input Register Mapping

Channel	Modbus Input Status Register	Common Terminal	Access
IN1	10001	C1	Read-Only
IN2	10002	C1	Read-Only
IN3	10003	C1	Read-Only
IN4	10004	C1	Read-Only
IN5	10005	C1	Read-Only
IN6	10006	C1	Read-Only
IN7	10007	C1	Read-Only
IN8	10008	C1	Read-Only

Output Register Mapping

Channel	Modbus Input Status Register	Common Terminal	Access
OUT1	00001	C2	Read/Write
OUT2	00002	C2	Read/Write
OUT3	00003	C2	Read/Write
OUT4	00004	C2	Read/Write
OUT5	00005	C2	Read/Write
OUT6	00006	C2	Read/Write
OUT7	00007	C2	Read/Write

Notes:

• Inputs (IN1-IN8) are read-only and correspond to Modbus Input Status Registers (10001 - 10008).

• Outputs (OUT1-OUT7) are read/write and correspond to Modbus Coil Registers (00001 - 00007).

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Specifications

Download SLM-DCI-8NP-DCO-7N Datasheet

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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)

# Read all 8 inputs
inputs = client.read_discrete_inputs(address=0, count=8)
print("Inputs:", inputs)

# Write to outputs
client.write_single_coil(0, True)  # Turn on output 1
client.write_multiple_coils(1, [True, False, True, False, True, False, True])  # Pattern for outputs 2-7

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 inputStartAddress = 0;     // The starting address of the inputs
int outputStartAddress = 0;    // The starting address of the outputs
int numInputs = 8;            // The number of inputs to read
int numOutputs = 7;           // The number of outputs to write

void setup() {
    # Setup modbus client
}

void loop() {
    // Read inputs
    uint16_t inputs[numInputs];
    ModbusRTUClient.requestFrom(slaveId, INPUT_STATUS, inputStartAddress, numInputs);
    for (int i = 0; i < numInputs; i++) {
        inputs[i] = ModbusRTUClient.read();
    }
    
    // Write to outputs
    ModbusRTUClient.beginTransmission(slaveId, COILS, outputStartAddress, numOutputs);
    for (int i = 0; i < numOutputs; i++) {
        ModbusRTUClient.write(i % 2);  // Alternate pattern
    }
    ModbusRTUClient.endTransmission();
    
    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
    // Inputs
    DCI8_1 AT %IB0 : BYTE;
    DCICH1 AT IX0.0 : BOOL;
    DCICH2 AT IX0.1 : BOOL;
    DCICH3 AT IX0.2 : BOOL;
    DCICH4 AT IX0.3 : BOOL;
    DCICH5 AT IX0.4 : BOOL;
    DCICH6 AT IX0.5 : BOOL;
    DCICH7 AT IX0.6 : BOOL;
    DCICH8 AT IX0.7 : BOOL;
    
    // Outputs
    DCO7_1 AT %QB0 : BYTE;
    DCOCH1 AT QX0.0 : BOOL;
    DCOCH2 AT QX0.1 : BOOL;
    DCOCH3 AT QX0.2 : BOOL;
    DCOCH4 AT QX0.3 : BOOL;
    DCOCH5 AT QX0.4 : BOOL;
    DCOCH6 AT QX0.5 : BOOL;
    DCOCH7 AT QX0.6 : BOOL;
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
DI1	Boolean
DI2	Boolean
DI3	Boolean
DI4	Boolean
DI5	Boolean
DI6	Boolean
DI7	Boolean
DI8	Boolean
DO1	Boolean
DO2	Boolean
DO3	Boolean
DO4	Boolean
DO5	Boolean
DO6	Boolean
DO7	Boolean

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.

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.