Beckhoff C1120 Manual de usuario descargar pdf (Pagina 28)

C1120 S5 to II/O-Lightbus Interface Beckhoff II/O-Lightbus System

Page 28 of 52 Version 2.1 Date 27.06.97

How to program a parallel channel communication:

a.) Request of the Siemens PLC to the C1120 interface (master is transmitter)

1. Write function number to PB/PY 252

2. Write argument 1 to PB/PY 251

3. Write argument 2 to PB/PY 250

4. Set strobe bit PB/PY 253.7

5. Wait for C1120 acknowlege bit PB/PY 253.6 to be "1" (function is started by

C1120 interface)

6. Reset strobe bit PB/PY 253.7

7. Wait for C1120 acknowlege bit PB/PY 253.6 to be "0" (end of handshake cycle).

b.) Answer of the C1120-interface to the Siemens PLC (master is receiver)

1. C1120 sets strobe bit PB/PY 253.7 after receiption of a function call as described

under a): Valid data bytes are ready to be read.

2. Read data: The function number is represented in PB/PY 252,

argument 1 is represented in PB/PY 251,

Argument 2 is represented in PB/PY 250.

3. Set acknowlege bit PB/PY 253.6 at end of data read.

4. C1120 interface resets strobe bit PB/PY 253.7.

5. End handshake cycle by resetting acknowlege bit PB/PY 253.6.

All steps of the handshake have to take place in the above described order. All function calls

are carried out with full handshake.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 51 52

Sin comentarios

Beckhoff C1120 Manual de usuario Pagina 28