Technical data

5-124 Bosch Rexroth AG | Electric Drives and Controls Rexroth VCP-Operating Concept | R911305038 / 01
Standard Mode
5.15 The Cyclical Polling Area
The cyclical polling area is a freely definable memory area in the con-
troller.
The controller writes to this memory area.
The operating device polls this memory area cyclically. In other words,
it reads the content in regular intervals.
The polling area is created in a byte-oriented or word-oriented manner.
The controller must be able to access this memory area bit-by-bit, and
the memory area must be continuous.
The operating device accesses this memory area byte-by-byte or word-
by-word.
The polling area is broken down into three zones:
1. Write Coordination byte (1 byte)
2. Serial message channel (2 bytes – high byte and low byte)
3. Control bytes for the status LEDs of the function keys (number de-
pends on the operating device type)
You must enter the starting address for the polling area in the system
parameters for the polling area.
Here, enter the length of the polling area and the polling time as well.
The length of the polling area is based on the number of status LEDs
on the operating device that is being used.
The polling time is based on the total system load. Note the cycle times
for other variables!
The structures of byte- and word-oriented polling areas are a little dif-
ferent. Therefore, a selection cannot be changed once made.