Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 59)

Field Wiring Arm Connections
Chapter 6
6Ć7
Solenoid valves with internal fault detection close automatically when the
valves detect a mechanical fault. They have no valve stem switches.
When using this type of solenoid valve, do not configure your
clutch/brake controller for valve-stem fault detection.
A valve with internal fault detection mechanically assures that both
solenoids energize in unison before the valve passes air. Should a fault
occur and only one side energizes, the valve will not pass air. Some
valves of this type have a poppet valve which blows and vents to the
atmosphere. The poppet valve must be manually reset.
All switches shown in Figure 6.2 or Figure 6.6 are optional. Decide
which ones you will use. Then, configure your clutch/brake controller
accordingly.
Optional Valve-stem Feedback
If main and auxiliary valve solenoids do not have valve-stem switches,
then consider omitting valve-stem feedback. If either one has valve-stem
switches, consider using valved-stem feedback. Then if some valves do
not have valve-stem feedback, you must simulate valve-stem feedback for
the valve(s) without valve-stem switches.
Follow these instructions if using valve-stem feedback:
If Using Then
ValveĆstem feedback 1) Enable valveĆstem feedback with
Ć backplane switches (Figure 3.3)
Ć PC configuration rungs (Figure 4.4)
2) All valves must use (or simulate) it.
3) Wire valveĆstem switch circuits to 2L1 (Figure 6.2 or 6.6)
ValveĆstem feedback, but
Main or Aux valve is NOT equipped
with external fault detection
(has internal detection) Modify above as follows:
1) Omit wiring the valveĆstem switch circuit
to 2L1 for that valve (Figure 6.2 or 6.6).
2) Simulate feedback for that valve by jumpering
terminals 0 and 7 in chassis A, the same in chassis B.
No valveĆstem feedback 1) Do not enable it
2) Do not wire valveĆstem switches
3) Do not jumper terminals for simulation
Optional
Valve Stem Switches,
Motion Detectors, and
Air Pressure Switches