Allen-Bradley ClutchBrake PLC-5 Series - How Bits Indicate Shaft Position

7–8 Set Up or Simulate Rotary Cam Limit Switches
Publication 65566.5.1 - October 1996
The software sets bits to indicate which of six zones the shaft is
rotating through during a press stroke.
Important: The software reads these zones according to the on/off
positions of ACAM, BCAM, and TCAM switches that you set
(Figure 7.1) mechanically for hardware switches or that the software
reads from resolver inputs if using resolvers to simulate your RCLSs.
The zones and corresponding indicator bits in bit file B160 are
shown in the following table and in Figure 7.7.
While the shaft is in this zone: The software sets this bit:
Top B160/60
Downstroke 61
Near Bottom 59
First Upstroke 62
ACAM Open 64
Second Upstroke 63
Figure 7.7
Zones
of Rotation That Indicate Shaft Position During a Press Stroke
and Corresponding Indicator Bits
Neartop
Zone
Nearbottom
Zone
Down
stroke
Zone
90
o
270
o
45
o
225
o
135
o
315
o
1st
Upstroke
Zone
2nd
Upstroke
Zone
ACAM
Open
Zone
ACAM
TCAM
BCAM
180
o
0
o
Bit
59
Example
indicator bit
Bit
60
Bit
61
Bit
62
Bit
64
Bit
63
Bit
59
Read these bits in your ladder logic to indicate shaft position.
How Bits Indicate
Shaft Position