MTS Systems FlexTest IIm Manual page 178

MTS 793 Controller Hardware
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• If you do not use the external hydraulic/program interlocks on
any of the D-15S connectors (J3A Sta 1, J3B Sta 2, J3C Sta 3, and
J3D Sta 4). Use an external jumper plug (PN 052-750-501) on
each connector not used.
• If you use the system digital I/O as a standalone unit. That is, if
you do not connect the System Digital I/O Module to a 497.xx
Chassis, you must use an external jumper plug (PN 050-774-701)
on the J5 497 Intlk connector.
This shows how to connect an external switch or set of relay contacts
to one of the station interlocks:
FlexTest IIm Controller Connections 177