Manual

Clutch/Brake Controller Hardware
Chapter 3
33
Table 3.A
Required and Optional Hardware
Quantity Item Cat. No. Function
Important: (Y ou must use 8point modules with 2slot addressing)
Required Hardware
2 Clutch/Brake Module 1771PM Monitors and controls the press
2 Wiring Arm 1771WB Connections to 1771PM
2 I/O Chassis 1771A2B Contains the modules
10 120V AC Input Modules 1771IA Monitors press inputs
2 120V AC Isolated Output Modules
(Series C) 1771OD Controls press outputs
Optional Hardware
2 120V AC Output Modules 1771OA Display of diagnostic messages
1 120AC Output Module 1771OA Controls optional indicators
2 120V AC Input Modules 1771IA Dump valve circuit
2 120V AC Isolated Output Modules
(Series C) 1771OD Dump valve and/or microinch circuit
2 I/O chassis 1771A4B Substitute chassis when using the
optional dump valve circuit.
1 120V AC Output Module 1771OA Microinch indicator
2 120V AC Input Modules 1771IA Microinch circuit
2 120V AC Input Modules 1771IA Additional operator stations
Clutch/brake modules operate in parallel to monitor and control your
press. Clutch/brake modules are also called “voting processors” because
they must always have a consensus. Unless both voting processors
constantly agree that they sense identical conditions in your clutch/brake
press system, either or both voting processors stop press motion or
prevent it from starting.
Your clutch/brake controller monitors and controls your press. Although
your PLC does not control your press, it does configure and enable the
clutch/brake controller. Your PLC ladder program can monitor inputs to,
and the status of, your clutch/brake controller. This allows your PLC to
control other indicators, machines, or processes related to your press
system.