Specifications

A-11

A LAUER driver

• 55555

The handling PB performs the data interchange in both directions.

The required times are to be taken from the description of the hand-

ling PB.

• 6666666666666666666

The answer package is transferred. Also the length of this package

is variable. As soon as the package is completely received by the

PCS, a new package is assembled, as described under 1.

If a (minimum) scan-time (without the time required for the handling PB)

is specified, the PCS calculates the package length for 2 and 6 during

each cycle, to keep time 4 as small as possible.

This logic functions only within certain limit values. So all tasks are guar-

anteed to be included in the package with a scan time of 60 milliseconds

and up and a baud rate of 19200 baud. With a scan time specification of

0 only 1 sub-packet will be included in each data interchange cycle. The

average length (without variable transfer) then totals 5.3 words (1.3

headers + 4 words of data).

The specification must be made in multiples of 1/100 seconds. Limit values

are 0..50 * 1/100 seconds, the default value totals 400 milliseconds.

Data transfer PCS 830 and I/O BUS The PCS 830 uses respectively 4 addresses in the additional I/O area

(EZ/AZ) on the I/O bus. These addresses have the following meaning

(only for diagnosis purposes):

1. Basis address +0 writing (AZ) = Board reset (hardware reset)

Basis address +0 reading (EZ) = presently without function

2. Basis address +1 writing (AZ) = Reset during communication

(software reset)

Basis address +1 reading (EZ) = Status channel

Bit 7 = 1 (Frame ready)-board is ready for data inter -

change

Bit 6 = 1 (Fetch list)-request of the cross-reference list

Bit 5 = 1 (Watchdog)-watchdog has been activated

Bit 4...3 = presently without function

3. Basis address +2,3 writing (AZ) + reading (EZ) = Data channel

Here, the data will be submitted.

The data transfer is managed by the enclosed -PCSKOMM PB, so no

evaluation is required by the user. The indicated meanings are only rele-

vant for diagnosis purposes. However, attention must be paid that the

user program never accesses the PCS 830 board. Otherwise correct

communication between the PCS 009/090/095/900/9000/9100/PCS plus

and PCS 830 is not guaranteed anymore.

This start behavior must be observed when presetting the transfer data

block.