Specifications

A-17

A LAUER driver

The implementation is limited (besides the cyclical call of the

PCSKOMM PB) to reading of and writing to the DWs in the transfer

data block (only with default assignment!). The presence of the (selec-

table) transfer data block is not examined. It must be present in the

programmable controller with the required net length (dynamic).

Otherwise the programmable controller shows a fault (possibly only

at the first call of a present value). A general fault bit ERORX (P3)

enables the communication status to be evaluated by the ladder

diagram. The data transfer has been stopped if this fault bit is set to

1. It can be restarted by setting the RSETX (P2) flag. Furthermore,

another flag FIRSTRUX (P4) for the restart is required. This is set

after the first successful processing of the handling block. The restart

flag must be reset in start OBs (as in the example on the floppy

disk).

Customer-specific blocks (PBs) are selected at 2 positions in the PCSKOMM

block:

1: (INIT) customer-specific presetting for the communication start

2: (COFF) customer-specific assignment for the communication loss

They are to be created and/or to be extended (perhaps separately per

channel).

Attention!

These blocks are of course available on the floppy disk (common for all

channels). However, they contain only one „HLT“ command with subse-

quent examples for the corresponding PCS operating consoles.

You should delete the „HLT“ command and extend the block corresponding

to the used operating console before you execute the example. If this is

not considered, the CPU enters the STOP state with the status „1“ shown

on the display.

Scan time extension The processing time of the handling block depends on several elements.

This is for one the specification of the programmable controller scan-

time (ZV, S,.. and/or „AA“ driver parameter) in the operating console. If

the specified time is sufficiently large compared to the selected baud

rate (e.g. exceeding 500 ms at 19200 baud), all cyclical tasks of the

operating console will be contained in each data packet i.e. all tasks are

cyclically replaced. On the other hand the number of the words to be

replaced depends on the number of variables (present values) in the

display and the message words to be transferred. This number is

adjustable for some PCS operating consoles.

Control Process time/ch.

CL300 approx. 10 ms

CL400/500 approx. 650 µs

PC600 approx. 3 ms

The response is optimal if the scan time is specified sufficiently large (in

the PCS) with the -PCSKOMM PB finding a PCS 830.3/1 board ready for

data interchange in each cycle.