Allen-Bradley ClutchBrake PLC-5 Series - Programming Press Ready to Start Indicators; Programming a Brake Monitor (Patent Pending); Selecting the Interrupt Period

4–22 Write Ladder Logic
Publication 65566.5.1 - October 1996
When starting multiple presses in a transfer line, you can program ladder
logic in program file PF15 that indicates when the clutch/brake control
modes are ready to start (Figure 4.26). Examine the following “ready”
bits that tell when permissives are satisfied to start running the press:
Bit Name Bit Address
inch mode ready B160/86
single stroke ready B160/108
run continuous ready B160/159
Figure 4.26
Example
Logic to Indicate the Press is Ready to Start
| Inch Mode Ready Indicator |
| B160 O:007 |
+–––] [––––––––––––––––––––––––––––––––––––––––––––( )––|
| 86 01 |
| |
| Single Stroke Ready Indicator |
| B160 O:007 |
+–––] [––––––––––––––––––––––––––––––––––––––––––––( )––|
| 108 02 |
| |
| Run Continuous Ready Indicator |
| B160 O:007 |
+–––] [––––––––––––––––––––––––––––––––––––––––––––( )––|
| 159 03 |
The brake monitor program is designed to monitor and compute
stopping time. This example program is contained in a selectable
timed interrupt (STI) subroutine with a 2 ms interrupt. The program
detects stopping time by counting the number of interrupts from
when the brake is applied until press motion stops. The accuracy
is" one interrupt period ("2 ms in this example).
Selecting the Interrupt Period
The example program scan jumps to the STI subroutine every interrupt
period, executes the subroutine, returns to the main program, and
continues executing the main program until interrupted again.
Starts
STI
Executes
STI Subroutine
Executes
Main Program
Returns to
Main Program
Starts
STI
Interrupt Period
Programming Pressready
tostart Indicators
Programming a
Brake Monitor
(patent pending)