Specifications

C-2

C Buep 19e-Expander driver

Loading of the 5P90BUEP Driver After selecting the 5P90BUEP driver in PCSPRO you have to set various

variables which are used by the drivers for the correct addressing of the

programmable controller. These are: baud rate, interface, data block

number, board address, number of sub-packets and timeout time.

Interfaces Interface and baud rate can be selected from combinations set with the

DIL switches 5 and 6 on the rearside of the PCS 090. The choice consists

of: RS-232C or TTY, 19200, 9600, 4800, or 1200 baud. The speed of the

communication depends decisively on the baud rate. Select only on a

slower baud rate if you have longer distances between the participants.

We recommend to communicate with 19200 baud via TTY.

The relation baud rate to maximum distance is as follows:

Baudrate max length RS-232C max. length TTY

19200 15m 150m

9600 15m 300m

4800 15m 350m

1200 15m 350m

When using a shielded and twisted cable with 14 x 0,14mm, a line resistance

of less than 138 /km, and a capacity of less than 120 pF/m.

Communication data block The number of the communication data block containing the send and

receive buffers must be passed on to the 5P90BUEP drivers (default

value=2). The communication data block consists of 69 data words (=

138 bytes).

Slot address The slot address (= block address) of the CPU to be addressed must be

passed on to the 5P90BUEP driver. Possible values are 0..3 for the CL

500, 30 for the CL 400, and 0 for the CL200 (default settings is 0). Once

you have set the address you can plug the communications cable into an

arbitrary programming unit interface in the CL 500 rack (including the SK

500). Always the CPU on this slot is addressed.

Number of sub-packets The number of sub-packets per sent packet can be set. If you select a

small value, the scan time load of the Expander module in the PLC is

decreased. However, simultaneously the response time of the com-

munication is increased. Possible values are between 1 and 50 (default

value).

Timeout time The timeout time to be set is the time in which a complete communi-

cation cycle must have been started including packet processing in the

programmable controller. Thus, the timeout time is composed out of 1

programmable controller scan time plus the data transfer time. The timeout

time is settable between 2.5 and 6 seconds. 2,5 seconds is default value.