Allen-Bradley 1771-PM User manual

User
Manual
Clutch/Brake
Module
(Cat. No. 1771-PM)
AllenBradley

Introduction 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Objectives
Of This Manual 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How To Use This Manual 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Terminology 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Firmware Revision Record 12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Press System Description 21. . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Components 21
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2.1
Functional Block Diagram 22. . . . . . . . . . . . . . . . . . . . . . . . . . .
Related
Safety Documentation 23. . . . . . . . . . . . . . . . . . . . . . . . . .
Clutch/Brake Controller Hardware 31. . . . . . . . . . . . . . . . . . .
Chapter Objectives 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Hardware Considerations 31
. . . . . . . . . . . . . . . . . . . . . . . .
Description of your Clutch/Brake Controller 31
. . . . . . . . . . . . . . . . .
Twinaxial Cable Connections 34
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Multiple Clutch/Brake Controllers 36
. . . . . . . . . . . . . . . . . . . . . . . . .
Panel Switches and Operator Stations 36
. . . . . . . . . . . . . . . . . . . . .
Interlock Switches 37
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Your Clutch/Brake Controller 37
. . . . . . . . . . . . . . . . . . .
Rack Address of Chassis A and B 39
. . . . . . . . . . . . . . . . . . . . . . . .
Setting
the Communication Rate 311. . . . . . . . . . . . . . . . . . . . . . . . .
Response Time 311
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module
Placement 312. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keying 314
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC Ladder Programming 41. . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Programming Fundamentals 41
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Rungs 43
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Matching Configuration Bits and Backplane Switches 47
. . . . . . . . . .
PLC Command Rungs 48
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Summary of PLC Configuration and Command Rungs 412
. . . . . . . . . .
Module Group 5, Slot 0 Reserved for MicroInch 413
. . . . . . . . . . . . . .
Module Groups 6 and 7 Reserved for Data Storage 413
. . . . . . . . . . .
Monitoring Clutch/Brake Controller Inputs and Outputs 413
. . . . . . . . .
Report Generation 414
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Summary of Clutch/Brake Controller Functions 415
. . . . . . . . . . . . . . .
Table of Contents

Table of Contentsii
Voting Processor Firmware 51. . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation
of V oting Processors 51. . . . . . . . . . . . . . . . . . . . . . . . . .
Emergency Shut Down 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fault
Monitoring 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation
of Cam Limit Switches 53. . . . . . . . . . . . . . . . . . . . . . . . .
Clutch/Brake Operating Modes 55
. . . . . . . . . . . . . . . . . . . . . . . . . .
Connections to Field Wiring Arms 61. . . . . . . . . . . . . . . . . . .
Chapter Objectives 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Considerations 61
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Connections and Safety Requirements 61
. . . . . . . . . . . . .
Control Power 63
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EStop Switches, Seal Relays, and Crowbar Relays 63
. . . . . . . . . . .
Crowbar T
est Inputs 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Hardwire Inputs 65
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Internal/External
Fault Detection 66. . . . . . . . . . . . . . . . . . . . . . . . .
Optional
Valve Stem Switches,
Motion Detectors, and
Air Pressure Switches 67
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Valve Solenoids A and B 68
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Auxiliary Valve Solenoids 69
. . . . . . . . . . . . . . . . . . . . . . . .
Optional Dump Valve Solenoids 69
. . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Microinch Valve Solenoids 610
. . . . . . . . . . . . . . . . . . . . . .
Electrical Noise Suppression 611
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cam
Limit Switches 620. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Hardwire Inputs 622
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inch Buttons and PlugIn Operator Stations 624
. . . . . . . . . . . . . . . . .
Optional Binary Display 627
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Optional Indicators 627
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lamp Test 631
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Inputs to Chassis C 631
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Considerations and Requirements 71
. . . . . . . . . . . .
Troubleshooting
with LED' s 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Troubleshooting Procedure 74
. . . . . . . . . . . . . . . . . . . . . .
Troubleshooting
Hints 74. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting Example 76
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Display of Diagnostic Message Codes 78
. . . . . . . . . . . . . . . . . . . . .
Types of Diagnostic Message Codes 79
. . . . . . . . . . . . . . . . . . . . . .
Messagecode Priority 712
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Processing Diagnostic Message Codes 713
. . . . . . . . . . . . . . . . . . . .

Table of Contents iii
Diagnostic Message Codes (Table 7.C) 713. . . . . . . . . . . . . . . . . . . .
Complete Listing of diagnostic message codes 723
. . . . . . . . . . . . . . .
Summary 737
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic diagnostic message codes in T
able 7.C 737. . . . . . . . . . . .
Bit Monitoring Addresses A1. . . . . . . . . . . . . . . . . . . . . . . . .
I/O FROM /T O LISTS B1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter 1
11
Introduction
This chapter will help you become familiar with the:
objectives of this manual
procedure for using this manual
We have written this manual to help an electrical engineering technician,
or any person with a similar background:
design a clutch/brake controller for a mechanical power press using the
1771-PM clutch/brake module.
install the clutch/brake controller
troubleshoot the clutch/brake controller
The overall safety of your mechanical power press rests upon your
knowledge of this manual and other referenced documents. Moreover, the
ease with which you can understand each chapter rests upon your
knowledge of previous chapters.
To simplify your installation and maintenance tasks, we recommend that
you become familiar with this entire manual before installing your
clutch/brake controller. The following suggestions should help you use
this manual:
Before reading this manual, scan through it. This will help you
understand its organization.
Before installing your clutch/brake controller, read this manual
thoroughly. You should also read other publications that we refer.
While installing or troubleshooting your clutch/brake controller, use
this manual as a reference.
Chapter Objectives
Objectives Of This Manual
How To Use This Manual

Introduction
Chapter 1
12
We define new terms where they first appear in this manual. You should
be familiar with the following terms because we use them throughout this
manual.
a press is a mechanical (part revolution) power press that is actuated by
a clutch and stopped by a brake
a clutch/brake controller is an Allen-Bradley controller, which
includes chassis A and B, two Clutch/Brake Modules (cat. no.
1771-PM), and associated I/O modules.
apress system includes your mechanical power press, clutch/brake
controller, and all associated wiring and components.
a PLC is any Allen-Bradley programmable controller that has 1771
remote I/O operation.
TCAM is the acronym for Top-Stop-Check Cam switch
ACAM is the acronym for Anti-repeat Cam switch
RCAM is the acronym for Run-on Cam switch
The firmware has been revised as follows:
Firmware
Revision Change in operation
A/B Micro-inch added
A/C None
(corrected intermittent stoppage in continuous mode)
A/D Motion detector time-out increased to 4 sec
A/E None
(corrected intermittent communications problem)
Terminology
Firmware Revision Record

Chapter 2
21
Press System Description
This chapter will help you become familiar with:
major components of a typical press system
safety requirements for a press system
A press system, as referred to in this manual, includes:
a mechanical power press
an Allen-Bradley clutch/brake controller
all associated control panels and operator stations
all associated output and feedback devices
all wires and cables that interconnect system components
A functional block diagram of a typical press system is shown in
Figure 2.1. This figure shows general relationships between major
components. Specific functional relationships vary according to the
requirements of your particular press system. For details, refer to;
chapters 3 thru 7 of this manual
technical documentation provided by your press manufacturer
ANSI B11.1, American National Standard for Machine Tools,
Mechanical Power Presses, Construction, Care, and Use
Important: Use an Allen-Bradley clutch/brake controller only with a
mechanical power press that has a part-revolution clutch. A
part-revolution clutch can be disengaged at any position of the shaft. This
allows your clutch/brake controller to stop the press at any position. In
contrast, a full-revolution clutch can be disengaged and stop the press
only at the top position of the stroke.
Chapter Objectives
System Components

Press System Description
Chapter 2
22
Figure 2.1
Functional Block Diagram
Operator
Station
No. 1
Operator
Station
No. 2
Operator
Station
No. 3
Operator
Station
No. 4
Allen - Bradley Clutch/Brake Controller
- Monitors operator inputs
- Monitors shaft position using cam limit switch feedback
- Controls the press using solenoid triac outputs
Air Supply
Cam
Switch
Assembly
Cam
Switch
Assembly
Shaft at Top Position
Shaft at Bottom Position
Press
Crankshaft
Flywheel
Clutch/Brake Assembly
Cam Switch
Feedback
Inputs
Triac
Outputs
to Main
Solenoids Main Solenoid Valves
Air to Clutch
12245

Press System Description
Chapter 2
23
This manual concentrates on safety considerations relative to the
clutch/brake controller. Study this entire manual and all technical
documentation provided by the press manufacturer before you install your
press system. In addition to local codes and laws, follow the safety
requirements detailed in the following publications:
OSHA Regulations, Title 29-Labor, Chapter XVII, Section 1910.217,
Mechanical Power Presses
ANSI B11.1, American National Standard for Machine Tools,
Mechanical Power Presses, Construction, Care, and Use
NFPA No. 79, Electrical Standard for Metalworking Machine Tools
Related Safety Documentation

Chapter 3
31
Clutch/Brake Controller Hardware
This chapter will help you become familiar with the:
hardware components of your Allen-Bradley clutch/brake controller
functional relationships between your PLC and clutch/brake controller
interconnections between your PLC and clutch/brake controller
switch settings that configure your clutch/brake controller and establish
its rack addresses
For details on how to install the I/O chassis and modules, refer to the
installation publications that apply to your particular PLC. These
publications, listed in our Publications Index (publication SD-499),
discuss general layout rules, mounting dimensions, enclosure
considerations, module keying, and field wiring arm connection
technique.
Important: If you are using a large mechanical power press that
generates high levels of shock and vibration, we recommend that you
shock-mount each I/O chassis of your clutch/brake controller.
Important: Electrostatic discharge can damage integrated circuits or semi
conductors in the PM Module if you touch backplane connector pins or
internal components.
CAUTION: Rid yourself of charge before handling the module
by touching a grounded object.
Your clutch/brake controller consists of chassis A and B connected to
your PLC in a serial chain with remote I/O chassis, as shown in
Figure 3.1. Table 3.A. lists required and optional clutch/brake controller
hardware.
Chassis A and B are similar to remote I/O chassis. The major difference
is that the left-most slot of chassis A and B contains a clutch/brake
module. In contrast, the left-most slot of an I/O chassis contains an I/O
adapter module.
Chapter Objectives
General Hardware
Considerations
Description of your Clutch/Brake
Controller

Clutch/Brake Controller Hardware
Chapter 3
32
Figure 3.1
Overview
of a Clutch/Brake Controller
Remote I/O
A-B Programmable Controller
with Remote I/O
Chassis A
Chassis B
Voting Processor A
Clutch/Brake Module
Remote
I/O
Clutch/Brake
Communications
12246
Remote I/O
Adapter Module
Chassis C
Remote
I/O Voting Processor B
Clutch/Brake Module
Remote I/O
Adapter Module
Remote I/O Chassis
Remote
I/O other I/O chassis
independent of the
Clutch/Brake Controller

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.

Clutch/Brake Controller Hardware
Chapter 3
34
In addition to chassis A and B, you must connect your PLC to at least one
local or remote I/O chassis, chassis C. You need two, three, or four inputs
at a local or remote I/O chassis.
Important: You must use 2-slot addressing and 8-point (single-density)
I/O modules.
Typical twinaxial cable connections of your clutch/brake controller are
shown in Figure 3.2. Connect your clutch/brake controller to your PLC as
part of its remote I/O distribution network. Use Twinaxial Cable (cat.no.
1770-CD) and Terminators (cat. no. 1770-XT).
Connect chassis A next to chassis B in the serial chain as shown in
Figure 3.2. You may connect one or more remote I/O chassis in the same
serial chain. Also, you may connect remote I/O chassis to other
distribution channels at the I/O scanner module of your PLC.
Connect four Terminator Resistors (cat. No. 1770-XT) as shown in
Figure 3.2. Connect one at:
the scanner module
the last chassis, whether it is a clutch/brake chassis or a remote I/O
chassis
each end of the cable that connects chassis A and B at terminals 7, 8
and 9 of the 1771-PM module field wiring arms
For more information on how to connect remote I/O channels, refer to the
installation publications that apply to your particular PLC. Also refer to
Product Data of the Remote I/O Adapter Module. These publications are
listed in our Publications Index (publication SD499)
Twinaxial Cable Connections

Clutch/Brake Controller Hardware
Chapter 3
35
Figure 3.2
Typical
T winaxial Cable Connections
Blue
Shield
Clear
Blue
Shield
Clear
Blue
Shield
Clear
Blue
Shield
Clear
Blue
Shield
Clear
Blue
Shield
Clear
Blue
Shield
Clear
Blue
Shield
Clear
Terminator
(cat. no.
1770 -XT)
Terminator
(cat. no.
1770-XT)
Terminator
(cat. no.
1770 -XT)
Terminator
(cat. no.
1770 -XT)
Terminal Strip on 1772 - SD,
SD2 Remote I/O Scanner/
Distribution Module (PLC - 2)
Processor/Scanner
Remote
I/O Chassis
1771 -ASB
Adapter
Module
Use Twinaxial Cable
(cat. no. 1770 -CD)
for all cable connections.
Chassis A
Chassis B
12248
or
Terminal Block on
1775 - S4A, - S4B, -S5,
Connector on PLC - 5
Processor
Connector on 5/50 - RS2
Remote I/O Scanner (PLC -5/250)
or
or
Chassis C
1771 - WB
Wiring Arm
1771 - PM
Module
1771 - WB
Wiring Arm
1771 - PM
Module
I/O Scanner Module (PLC -2)

Clutch/Brake Controller Hardware
Chapter 3
36
Although this manual describes a single clutch/brake controller, you may
connect your PLC to multiple controllers, each controlling a separate
press. Each clutch/brake controller uses two remote I/O racks for chassis
A and B. For example, since a PLC-3 controller can support as many as
32 I/O racks, you may connect it to as many as 15 clutch/brake controllers
with two additional I/O racks for modules in chassis C.
You can operate your press using up to four operator stations and an
optional control panel. Installations vary according to the type of
mechanical press and its application requirements. The number of
stations, control switches contained in each, and the control panel could
be as follows:
Assembly Control Switches Notes
Control Panel and/or Station 1 Mode select
Arm continuous
Stopontop
L/R Inch
Press enable
Reset latched messages
Lamp test
L/R Run
EStop
1
1
1 and/or 3
2
3
3
3
2
2
Stations 2 thru 4 L/R Run
Stop On T op
EStop
2
2 and/or 3
2
1Connect these switches to input modules in chassis Aand B(Figure 6.10).
2Connect these switches to input modules in chassis Aand B(Figures 6.11 thru
6.12).
3These switches are inputs for command rungs (Figures 4.6 thru 4.8). Connect
these switches to input modules in remote I/O chassis C(Figure 6.15).
Multiple Clutch/Brake
Controllers
Panel Switches and Operator
Stations

Clutch/Brake Controller Hardware
Chapter 3
37
Various interlock switches are required for safety as specified in ANSI
B11.1. The locations, types, and quantities vary with the type of
mechanical press and its application requirements. Use these interlock
switches to prevent the press from starting or to stop the press when
operation could cause injury to personnel or damage to the press.
Interlock Switch Quantity Reference
Barrier guard 1 or more Figures 6.10 and 6.15
Press interlock 1 Figures 6.1 and 6.5
Motion detector 1 Figure 6.2 and 6.6
Main motor forward 1 Figure 6.10
Cam limit switch assembly 2 Figure 6.9
topstopcheck (TCAM)
runon (RCAM)
antirepeat (ACAM)
You have flexibility in selecting clutch/brake controller functions. You
may select any of the following functions according to your application
requirements by setting switches on the I/O chassis.
Operator station 3 and 4
Motion detector feedback
Valve stem feedback
Air pressure feedback
Ungrounded or grounded AC power
On-the-hop
Half stroke, or Stroke-and-a-half
Dump valve circuit
Micro-inch
Interlock Switches
Configuring Your Clutch/Brake
Controller

Clutch/Brake Controller Hardware
Chapter 3
38
Figure 3.3
Backplane
Switch Settings
Backplane
Switches
Assembly
Chassis
A and B
Position:
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Function:
Use Stations 3 and 4
Stations 3 and 4 not used
Use Motion Detector Feedbck
Motion Detector Feedback not used
Use Valve Stem Feedback
Valve Stem Feedback not used
Use Air Pressure Feedback
Air Pressure Feedback not used
Ungrounded AC Power
Grounded AC Power
Use On-The-Hop
On-The-Hop not used
Switch
No:
2
3
4
5
6
7
8
12345678
O
N
O
F
F
Always OFF
ON
OFF OFF
IMPORTANT: 12249
Make backplane switch settings in chassis A and B identical.
Use StrokeAndAHalf
Use HalfStoke

Clutch/Brake Controller Hardware
Chapter 3
39
Important: There is no backplane switch setting to configure the optional
dump valve circuit. You configure the optional dump valve circuit by
inserting dump valve modules (cat. no. 1771-OD and 1771-IA) into
module group 4, slots 0 and 1, respectively of chassis A and B. You must
also set bit 14 unconditionally in your configuration rungs.
Important: To configure your clutch/brake controller for Micro-inch, see
chapter 4 “Module Group 5, Slot 0 Reserved for Micro-inch”.
Important: Your PLC ladder program must include unconditioned
configuration rungs that set or reset configuration bits to match the
settings of backplane switches. Refer to chapter 4.
Establish the address of chassis A and B in each clutch/brake module so
the PLC can communicate with it. Use valid rack addresses as
determined by your PLC.
Switch assembly SW-1 determines the rack address. It is located under a
sliding cover plate on the left side of the clutch/brake module near the top.
Loosen the two screws holding the cover plate and slide it open. Locate
switch assembly SW-1 at the top of the printed circuit board as shown in
Figure 3.4.
Using switch assembly SW-1, designate chassis A and B as follows:
Chassis A - any rack address having position 6 OFF
Chassis B - next consecutive upper or lower rack address
Important: If your ladder program monitors rack adapter fault bits for
each chassis containing a clutch/brake module, the fault bits will indicate
a faulted rack whenever the module trips power to I/O swingarms. This is
because clutch/brake modules stop all communciation with the PLC until
they verify that swingarm power has been disconnected.
Important: Always configure I/O racks assigned to clutch/brake
controllers as full racks, so the PLC can write configuration bits to each
PM chassis in Module Group 7.
Rack Address
of Chassis A and B

Clutch/Brake Controller Hardware
Chapter 3
310
Figure 3.4
Rack
Address Switch Setting on 1771PM Module
PLC-2/30
PLC-5/25
1
2
3
4
5
6
7
1
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
2
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
Switch Assembly SW-1 Position
NOTE: Chassis A and B must have consecutive rack addresses.
12345678
O
N
O
F
F
ON
OFF OFF
1234
O
N
O
F
F
SW-1 SW-
2
Always ON (starting
Module Group 0) Always OFF
Always ON(57.6K baud)
3
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
12250
PLC-3
00
01
02
03
04
05
06
07
10
11
12
13
14
15
16
17
20
21
22
23
24
25
26
27
30
31
32
33
34
35
36
37
4
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
5
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
6
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
Chassis
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
B
A
Rack Addresses
PLC-5/250

Clutch/Brake Controller Hardware
Chapter 3
311
For example, if you choose rack address 2 for chassis A, you must choose
rack address 1 or 3 for chassis B.
Set the rack address in each clutch/brake module. Place a label on each
clutch/brake module to identify in which chassis, A or B, it belongs.
Important: Chassis A and B rack addresses must be unique. No I/O
chassis can have the same rack address as either chassis A or B. This
restriction prohibits using the rack address of either chassis A or B for any
complementary I/O chassis (a chassis with the same module addresses but
having input modules where chassis A and B have output modules, and
output modules where chassis A and B have input modules). This
restriction also prohibits using the rack address of either chassis A or B
for any partial remote I/O chassis (a chassis that starts with module group
2, 4, or 6). (Refer to chapter 4, Module Group 7, PLC Command Rungs,
for reasons why you must restrict the use of this address.)
Triacs of your clutch/brake controller turn on in sequential order. Triacs
connected to the high AC power line (L1) turn on before those in the
triac-solenoid string connected to the low AC power line (L2). If the
addresses are reversed, the triacs will turn on out of sequence, and the
clutch/brake controller will not operate.
Set switch 1 on switch assembly SW-2 to the ON position. This sets the
module’s communication rate at 57.6K baud. Be sure that you set the
communication rate of both 1771-PM modules and the processor’s
scanner to 57.6K baud, as well.
The worst case time required for the clutch/brake controller to respond to
a change of input depends on Module-response and triac-switching times:
Characteristic
Delay
(ms)
1771IA module
response time 26
1771PM module
response time 10
T riac switching time 8
T otal response time 44
Setting the Communication Rate
Response Time