Modbus I/O Access

Modbus TCP Application

If you have a Modbus RTU or Modbus ASCII program, you can access the I/O by connecting to the

IOLAN over the network.

 

 

 

 

Network

 

UID: 15

 

 

 

 

 

 

 

 

 

 

perle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a

 

IOLAN

PC running

 

Modbus RTU

 

 

 

 

or ASCII

 

 

 

Application

 

 

 

Power

I/O Digital

Output

Modbus I/O Access

The section defines the function codes and registers you will need to access the I/O through Modbus TCP, Modbus serial, or Modbus serial/TruePort.

Function Codes

The following function codes are supported by the IOLAN:

z01 read coils

z03 read multiple holding registers

z04 read input registers

z05 write coil

z06 write single register

z08 diagnostics (echo the request)

z15 force multiple coils

z16 write multiple registers

There are four Modbus data models:

Discrete Input

Not used

 

 

Coils

Digital Input (DI), Alarm state for DI, Digital Output (DO). All coils

 

are Boolean values and are 1 byte.

 

 

Input Registers (IR)

Analog Input (AI), Alarm state for AI. All Input Registers are 2 bytes

 

long.

 

 

Holding Registers

Status (R), Control value (R/W or W). Holding Registers with _ENG

 

registers are 4 bytes long, all other Holding Registers are 2 bytes

 

long.

 

 

All coil/register values are in decimal.

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Perle Systems TS2, DS1 manual Modbus I/O Access, Modbus TCP Application, Function Codes

DS1, TS2 specifications

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