Specifications

C-4

C Buep 19e-Expander driver

Communication ERROR When communicating with each other the PCS operates as master (AST)

and the PLC as slave (PST). Thus, it is the PCS´s task to set up the

communication and to perform monitoring. Thereby, 3 criteria must be

monitored: is communication active, is communication processing in the

PLC active, and does the PLC indicate faults. Data are transferred to/

read from the PLC via the BUEP19E protocol. The timeout times for the

protocol are fixed (2.4s max.) which allows no statement about data

processing. Therefore, the processing timeout is set using the PROJECT/

DRIVER PARAMETER menu in PCSPRO.

In case of an error, an error message is displayed on the PCS and the

ERROR LED flashes. The PCS tries to set up communication again in

the background. The error message is erased if this has been successful.

Error message (whereby the fault text on the bottom line is described

below):

========== COMMUNICATION ERROR ==========

FAULT TEXT

• TIMEOUT COMMUNICATION

This error message is output if the protocol timeout time of 2.4 expires.

TIMEOUT PLC. This display is shown in case the task package is

not processed by the programmable controller. This is the case if the

program will not execute PCS_KOMM, or the restart input is not set

following a communication loss. The Timeout time for the order

processing is settable via the timeout parameter in the range of 500ms

to 2.55 s.

• PLC ERROR RECEIVED

The programmable controller indicates via the BUEP19E protocol if

a fault has appeared. This can happen if the addressed data block is

too small or not present or an inadmissible access occurs. Therefore,

examine the settings of the driver variables and the definitions in the

programmable controller (e.g. symbol file).

• TOO MANY REPETITIONS

The faulty position is repeated if a fault appears in the communication.

The communication is interrupted and the following error message

is output after 3 unsuccessful repetitions. In this case the PCS/PLC

connection has been routed through a noisy environment, the cable

is too long for the selected baud rate or earthing is insufficient.

• PLC IN STOP

This error message is output if the status of the PLC has been check

and the CPU was not in „RUN“ mode.

• WRONG BLOCK NUMBER

The block address of the CPU (set via CPU slot) to be addressed is

checked by the protocol. This error message is output if the corres-

ponding CPU is not present.