Modbus Read Polling Trigger

Overview

Modbus Read Polling Trigger starts a flow by repeatedly reading values from a Modbus device.

Use this trigger for periodic monitoring of coils, discrete inputs, or registers.

Input

Setup Tool (Modbus Init)

string required

Reference to a Modbus Client Initialization node.

Function Code

integer required

Read function code:

• 1 Read Coils
• 2 Read Discrete Inputs
• 3 Read Holding Registers
• 4 Read Input Registers

Register Data Format

string

Data format used for register decoding when Function Code is 3 or 4.

Start Address

integer required

Start register/coil address (base-0 indexing).

Number of Values

integer required

How many values to read from Start Address.

Polling Interval (ms)

integer required

Polling period in milliseconds.

Minimum: 10
Default: 1000

Number of Read Attempts

integer advanced

Retry attempts per polling read operation.

Output

Response Code

integer

Response code returned by the Modbus read operation.

Array of Read Values

array

Values read from the device for the configured address range.