Bosch Rexroth BTV 20.4A, Planning Manual

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4.2.4 Machine and PLC Function Keys
General Information
Fig.4-7: Position of the machine and PLC function keys
Machine Function Keys
The machine function keys are available as direct hard-wired inputs at the PLC;
there they can be triggered with an absolute address. These keys are used for
starting projected PLC or CNC movements.
PLC Function Keys
Additionally, the illuminated keys of the BTV 20 can be labeled with slide-in
strips . Together with the key switches, these keys are connected to the PLC;
these keys replace standard switching elements for fix PLC functions, e.g.
"Basic setting" or "Stop after end of cycle" etc.
Project Planning Manual | Rexroth MTA 200 Electric Drives
and Controls
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Machine Operator Terminal BTV 20.4A