Technical data

5-116 Bosch Rexroth AG | Electric Drives and Controls Rexroth VCP-Operating Concept | R911305038 / 01
Standard Mode
5.11.4 Reaction Time of Function and Soft Keys
Whenever function keys need to influence PLC variables, they are
given highest priority when transferred via the protocol. The reaction
times during the transfer procedure are protocol-specific and range
from 60 to 120 ms. This is the period of time which elapses after a key
has been pressed until an output is set or reset in the PLC. The reac-
tion time varies depending on the protocol itself, the load on the proto-
col (cyclical data, etc.) and the cycle time of the PLC.
Note that reaction times can be influenced by the polling times of the
variables, messages and images of the LEDs.
5.11.5 Using Control Keys as Function Keys
Control keys can alternatively be used as function keys to trigger cer-
tain actions in the PLC. They can be defined to carry out the same
functions as function keys, i.e. they are capable of assigning any val-
ues to a variable. The transfer procedure is independent of the mask
parameter assignment. Thus, if a control key is to carry out a specific
function in a mask, it should not be programmed as a ‘mask selector
key’ at the same time. The mask-specific evaluation is identical to that
of the function key.
5.11.6 Function Keys Controlling Parallel Outputs
Groups of eight function keys can be linked to parallel outputs (semi-
conductor outputs). The keys are read in by the software, debounced
and then mapped to the outputs. The reaction time to the outputs is
around 30 ms. The parallel output option offers users the advantage
that the keys act on the PLC very quickly and independently of the pro-
tocol. They are ideal for controlling axes or for programming jogging
mode!
The power output allows direct control of PLC inputs.
If a PLC variable has been programmed for the function key in addition
to the output, it is of course also sent to the controller, though with a
small time delay.