ADLINK Technology cPCI-8168, User Manual

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28 Signal Connections
3.4 End-Limit Signals PEL and MEL
There are two end-limit signals PEL and MEL for one axis. PEL
indicates end limit signals in the plus direction and MEL indicates
end limit signals in the minus direction.
The signals connection and relative circuit diagram is shown in the
following diagram. The external limit switches featuring a contact
capacity of +24V, 6mA minimum. You can use either A-type (nor-
mal open) contact switch or B-type (normal closed) contact switch
by setting the DIP switch S1. The cPCI-8168 is delivered with all
bits of S1 set to OFF, refer to section 1.7.