SLM-RLY-16

SLM-RLY-16

---

Channels: 16
Discrete Output Type: Relay FORM A (SPST)
Rated Voltage: 6.25-30 VDC, 6-120 VAC Register Type: Discrete Output/Coil

Specifications:
Download SLM-RLY-16 Datasheet

Description

• 16-channel relay output module.

• Two common terminals (C1 and C2) for grouped relay control.

• Supports 6.25-30 VDC or 6-120 VAC relay switching.

• Two common terminals (C1 and C2) allow grouping of relay outputs.

• Supports both AC and DC loads, providing flexibility in industrial applications.

---

Configuration

• No configuration required

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	Common Terminal	Access
OUT1	00001	C1	Read/Write
OUT2	00002	C1	Read/Write
OUT3	00003	C1	Read/Write
OUT4	00004	C1	Read/Write
OUT5	00005	C1	Read/Write
OUT6	00006	C1	Read/Write
OUT7	00007	C1	Read/Write
OUT8	00008	C1	Read/Write
OUT9	00009	C2	Read/Write
OUT10	00010	C2	Read/Write
OUT11	00011	C2	Read/Write
OUT12	00012	C2	Read/Write
OUT13	00013	C2	Read/Write
OUT14	00014	C2	Read/Write
OUT15	00015	C2	Read/Write
OUT16	00016	C2	Read/Write

Notes:

• Outputs (OUT1-OUT16) are read/write and correspond to Modbus Coil Registers (00001 - 00016).

---

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:
    client.write_single_coil(3, True); # Write 1 to coil address 3 (channel 4)
    time.sleep(1)
    client.write_multiple_coils(0, [True, False, True, False, True, False, True, False, True, False, True, False, True, False, True, False]); # Alternate values to coils 0-15
    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

#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 coils
int numCoils = 16;         // The number of coils to write (0-15)
int coilValues[] = {1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0}; // Values for coils 0 through 15

void setup() {
    # Setup modbus client
}

void loop() {
    writeMultipleCoilsPattern_BeginWriteEnd();
    delay(1000);
}

void writeMultipleCoilsPattern_BeginWriteEnd() {
  // Start writing multiple coils
  ModbusRTUClient.beginTransmission(slaveId, COILS, startAddress, numCoils);

  // Write the pattern 1, 0, 1, 0, 1, 0, 1, 0 for coils 0-7
  for (int i = 0; i < numCoils; i++) {
    // Write 1 for even coils (0, 2, 4, 6), 0 for odd coils (1, 3, 5, 7)
    ModbusRTUClient.write(coilValues[i]);
  }

  // Send the write request
  ModbusRTUClient.endTransmission();
}

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
    RLY16_1 AT %QB0 : BYTE;
    RLY16_2 AT %QB1 : BYTE;
    RLYCH1 AT QX0.0 : BOOL;
    RLYCH2 AT QX0.1 : BOOL;
    RLYCH3 AT QX0.2 : BOOL;
    RLYCH4 AT QX0.3 : BOOL;
    RLYCH5 AT QX0.4 : BOOL;
    RLYCH6 AT QX0.5 : BOOL;
    RLYCH7 AT QX0.6 : BOOL;
    RLYCH8 AT QX0.7 : BOOL;
    RLYCH9 AT QX1.0 : BOOL;
    RLYCH10 AT QX1.1 : BOOL;
    RLYCH11 AT QX1.2 : BOOL;
    RLYCH12 AT QX1.3 : BOOL;
    RLYCH13 AT QX1.4 : BOOL;
    RLYCH14 AT QX1.5 : BOOL;
    RLYCH15 AT QX1.6 : BOOL;
    RLYCH16 AT QX1.7 : 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
DO1	Boolean
DO2	Boolean
DO3	Boolean
DO4	Boolean
DO5	Boolean
DO6	Boolean
DO7	Boolean
DO8	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.

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.

---

Specifications

Download SLM-RLY-16 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.