Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 42)

Voting Processor Firmware
Chapter 5
5Ć3
The PM Module uses cam limit switches to determine press slide position.
(Figure 5.1 and Table 5.A). You set two independent cam limit switch
assemblies to the same settings so that:
run-on contacts are closed in the near bottom and upstroke zones
top-stop-check contacts are closed in the downstroke and near-bottom
zones
anti-repeat contacts open during mid-upstroke for at least 70ms. Set the
open span to the approximate number of rotational degrees (10
0 -
45
0
)
according to the speed of the press (1spm - 100spm).
UpĆStroke Span vs. Press Speed for AntiĆRepeat Contacts
100
90
80
70
60
50
40
30
20
10
Press
Speed
SPM
15 30 45
Open Span During Up - Stroke
12971
0 0 0
The anti-repeat cam is not required while operating in inch or micro-inch
mode. However, before entering any operating mode, the PM module
checks that at least one cam limit switch is closed at any point in the
cycle.
Operation of Cam Limit Switches