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Chapter 2 Specification of Communication port for CPU module

2 – 41

(B) Sample program

The following shows a simple program which communicates between one master station and three slave

stations using RS-485.

[1] Mounting the module

(a) Master station side

Power supply

EHV-CPU

16-point output

0 1

Mounts the 16-point output module in the slot 1 of the

basic base.

(b) Slave station side

Power supply

EHV-CPU

16-point input

16-point output

0 1

Mounts the 16-

oint input module in the slot 0 of the basic

base, and the 16-point output module in the slog 1 of the

basic base.

[2] Assigning internal output

A sample program is created using the following assignments. In actual cases, change the I/O number etc.

according to the application.

(a) Assigning internal output in the master station side

I/O No. Usage

WM 100 to 10E TRNS 0 command

Parameter area (s to s+14)

R 000 to 00B TRNS 0 command

Communication control bit area (t to t+11)

100 Transmission data setting completion flag

WR 0000 to 001F Transmission data area (32-word)

0100 to 011F Receiving data area (32-word)

4000 Slave station number for communication

4001 Number of slave stations

WL 001 to 003 Storage area for receiving data

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RTS WM300 Spezifikationen Seite 55