Rockwell Automation 1785 PLC-5 User manual

1785 PLC-5 Programmable Controllers
Quick Reference
Addressing Instruction SetHardware Components Switch Settings Troubleshooting
Front Panels ........................ 1-1
Processor Comparison......... 1-6
1771 I/O Chassis ............... 1-10
Power Supplies.................. 1-11
Keyswitch.......................... 1-13
Processor Status File ......... 1-14
I/O Status File .................... 1-30
Data Table Files ...................2-1
Program Files ......................2-4
I/O Image Addressing...........2-5
Logical Addressing...............2-6
Indexed Addressing..............2-7
Indirect Addressing ..............2-7
I/O Addressing Modes ..........2-8
I/O Placement ......................2-8
Concept Summary................2-9
Status Bits........................... 3-1
Relay................................... 3-2
Timer .................................. 3-5
Counter ............................... 3-7
Compare ............................. 3-9
Compute ........................... 3-12
Logical .............................. 3-22
Conversion ........................ 3-24
Bit Modify and Move.......... 3-26
File.................................... 3-28
Diagnostic ......................... 3-30
Shift Register..................... 3-32
Sequencer......................... 3-35
Program Control ................ 3-36
Processor Control and
Message ........................... 3-41
Block and ControlNet
Transfer ............................ 3-43
ASCII ................................. 3-47
Chassis Backplane...............4-1
Chassis Configuration ..........4-3
Complementary I/O ..............4-4
Enhanced and
Ethernet PLC-5 ....................4-7
ControlNetwork Address .... 4-11
Classic PLC-5 .................... 4-12
Ethernet Jumper ................4-21
Enhanced and Ethernet PLC-5
General .........................5-1
Communication.............5-3
PLC-5/40L and PLC-5/60L
Communication ....................5-5
Ethernet
Status and Transmit .............5-7
ControlNet
Status Indicators ..................5-8
Classic PLC-5
General ..............................5-12
Adapter Mode .............5-14
Scanner Mode.............5-15
Remote I/O .........................5-17
Extended Local I/O .............5-25
Flex I/O ControlNet .............5-28
1771 I/O ControlNet............5-29
ControlNet I/O Status..........5-30
ControlNet Errors................5-35
Fault Codes ........................5-45

Using this Manual
This Quick Reference provides information frequently needed for using and maintaining your Allen-Bradley
PLC-5 processor.
It is intended for reference purposes only, and not as the sole source of information.
For more specific information on any topic in this Quick Reference, see:
• Enhanced and Ethernet PLC-5 Family Programmable Controllers User Manual, publication 1785-6.5.12
• Classic PLC-5 User Manual, publication 1785-6.2.1
• ControlNet PLC-5 Programmable Controllers Phase 1.5 User Manual, publication 1785-6.5.22
Important User Information
Because of the variety of uses for the products described in this publication, those responsible for the application
and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that
each application and use meets all performance and safety requirements, including any applicable laws,
regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for
purposes of example. Since there are many variables and requirements associated with any particular installation,
Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use
based upon the examples shown in this publication.

The Safety Guidelines for the Application, Installation, and Maintenance of Solid State Control, publication
SGI-1.1 (available from your local Allen-Bradley office), describes some important differences between
solid-state equipment and electromechanical devices which should be taken into consideration when applying
products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole or in part, without written permission of
Allen-Bradley Company, Inc. is prohibited.
Summary of Changes
In this release of the PLC-5 Quick Reference, we have altered the way we reference software documentation.
Rather than show specific screens and key sequences which may vary according to the software package you
are using, we refer you instead to the programming software documentation that accompanies your particular
software package. Of course, we still provide the essential reference information you need to quickly accomplish
your tasks, but if you have specific questions about software procedures, you should refer to your programming
software documentation set.
To help you find new information, we included change bars as shown to the left of this paragraph.

Conventions
The table below describes the naming conventions used in this manual:
☞You see this symbol in the lower right-hand corner of the page when information is continued on the next page.
© 1999 Rockwell Automation
PLC, PLC-2, PLC-3, PLC-5, PLC-5/10, PLC-5/11, PLC-5/12, PLC-5/15, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40, PLC-5/40L, PLC-5/60, PLC-5/60L, PLC-5/80, PLC-5/20E, PLC-5/40E, PLC-5/80E, PLC-5/250,
PLC-5/20C, PLC-5/40C, PLC-5/80C, Ethernet, and DH+ are trademarks of Rockwell Automation.
This name: Represents these processors:
Enhanced PLC-5/11™PLC-5/40™
PLC-5/20™PLC-5/60™
PLC-5/30™PLC5/80™
PLC-5/40L™PLC-5/60L™
Ethernet PLC-5/20E™PLC-5/40E™
PLC5/80E™
ControlNet
Phase 1.5 PLC-5/20C15™5/40C15™
5/80C15™
Classic PLC-5/10™PLC-5/15™
PLC-5/12™PLC-5/25™

Hardware Components
Front Panel 1-1
Front Panel – Enhanced
PLC-5 Processors
Channel 1A
fixed DH+ port
Keyswitch
Channel 0 - on-board
serial port
Channel 1A status
indicator (green/red)
Connect programming terminal
here when channel 1A is configured
for DH+ communications
Channel 1A communication port
Install memory
module here
Battery holder
Channel 1B status
indicator (green/red)
Channel 1B
communication port
PLC-5/11 Processor PLC-5/20 Processor
Battery (red)
Processor RUN/FAULT (green/red)
Force (amber)
Channel 0 communication
status (green)
Indicators:

Hardware Components
Front Panel 1-2
PLC-5/30, -5/40, -5/60,
-5/80 Processor PLC-5/40L, -5/60L Processor
Keyswitch
Battery holder
Channel 2A status
indicator (green/red)
Connect programming terminal here
when channel 2A is configured for
DH+ communications
Channel 2A communication port
Channel 2B communication port
Channel 1A status
indicator (green/red)
Channel 1A communication port
Channel 1B communication port
Channel 2 status
indicator (green/red)
Channel 2
extended-local I/O
communication port
Channel 2B
status indicator
(green/red)
Install memory
module here
Channel 1B
status indicator
(green/red)
Channel 0 - on-board
serial port
The PLC-5/30 processor has 2 communication ports and 1 serial port
Battery (red)
Processor RUN/FAULT (green/red)
Force (amber)
Communication ACTIVE/FAULT
status (green/red)
Indicators:
Labels to write information
about the channel
communication mode,
station addresses, etc.
Connect programming terminal here
when channel 1A is configured for
DH+ communications

Hardware Components
Front Panel 1-3
Front Panel – Ethernet
PLC-5 Processors
PLC-5/20E Processor
Keyswitch
Channel 0 - on-board
serial port
Channel 1A status
indicator (green/red)
Connect programming
terminal here
Channel 1A
Battery (red)
Processor RUN/FAULT (green/red)
Force (amber)
Channel 0 communication
status (green)
Install memory
module here
Battery holder
Channel 1B status
indicator (green/red)
Channel 1B
Channel 2 Ethernet
status indicators
Channel 2
Indicators:
Battery (red)
Force (amber)
Communication
ACTIVE/FAULT (green/red)
Channel 0 - on-board
serial port
Labels to write information
about the channel
communication mode,
station addresses, etc.
Keyswitch
Channel 1A
Channel 1B
Battery holder
Channel 2
Indicators:
PLC-5/40E, -5/80E Processor
Channel 1A status
indicator (green/red)
Connect programming
terminal here
Channel 2 Ethernet
status indicators
Processor RUN/FAULT
(green/red)
Install memory
module here
Channel 1B status
indicator (green/red)

Hardware Components
Front Panel 1-4
Channel 2 Status Indicators
PLC-5/20C15 Processor
Keyswitch
I/O Status Indicator
Network Access Port
Channel 2
Channel 0
Channel 1 Status Indicators
DH+ Programming Terminal
Connection to Channel 1A
Channel 1A
Battery
Processor RUN/FAULT
Force
Channel 0 Communication
ACTIVE/FAULT
Memory Module Space
Battery Holder
Channel 1B
Keyswitch
I/O Status Indicator
Channel 2 Status Indicators
Network Access Port
Channel 2
Channel 1 Status Indicators
DH+ Programming Terminal
Connection to Channel 1A
Channel 1A
Channel 1B
Battery
Processor RUN/FAULT
Force
Channel 0 Communication
ACTIVE/FAULT
Channel 0 - on-board serial port
Memory Module Space
Battery Holder
PLC-5/40C15, -5/80C15 Processor
Front Panel – ControlNet PLC-5 Processors
ControlNet PLC-5 Processors
Phase Catalog Number
1.0/1.25 1785L20C, -L40C, -L80C
1.5 1785L20C15, -L40C15, -L80C15

Hardware Components
Front Panel 1-5
Hardware Components
REM I/O indicator
ACTIVE/FAULT
(green/red) P
R
O
G
PLC-5/10 Processor PLC-5/12, -5/15, -5/25 Processor
Keyswitch
DH+ communication
indicator ACTIVE/FAULT
(green/red)
Connect programming
terminal here
Connect DH+
link here
Adapter indicator
(green)
Connect remote
I/O link here
Battery holder
Write the DH+
network station
number on this label
12373
Battery (red)
Processor RUN/FAULT (green/red)
Force (amber)
Indicators:
Front Panel – Classic
PLC-5 Processors

Hardware Components
Processor Comparison 1-6
Comparison Chart for
PLC-5 Family Processors
Processor Memory
(Words)
Local
Chassis
Remote Chassis
(I/O Racks)
I/O Capacity Communication
PLC-5/10 6K 1 resident none 128 (8-pt) 1, 256 (16-pt) 1, 512 (32-pt) 1DH+ link
PLC-5/12 6K 1 resident none 128 (8-pt) 1, 256 (16-pt) 1, 512 (32-pt) 1adapter, DH+ link
PLC-5/15 6K
(expands to
14K)
1 resident 12
(3 I/O racks) • 512 1
• 512 inputs and 512 outputs using 16- or
32-pt modules 2
adapter/remote I/O scanner, DH+ link
PLC-5/25 13K
(expands to
21K)
1 resident 28
(7 I/O racks) • 1024 1
• 1024 inputs and 1024 outputs using 16-
or 32-pt modules 2
adapter/remote I/O scanner, DH+ link
PLC-5/11 8K 1 resident 4
(1 I/O rack)
rack must be
addressed as rack
3
• 256 (8-pt), 384 (16-pt), or 512 (16-pt) 1
• 512(16-pt) or 768 (32-pt) 2
• 1 channel (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
1 Any mix of I/O
2 Maximum I/O possible using 16-pt modules with 2-slot addressing or 32-pt modules with 1-slot addressing. Modules must alternate input/output in the chassis slots.

Hardware Components
Processor Comparison 1-7
PLC-5 comparison chart continued...
Processor Memory
(Words)
Local
Chassis
Remote Chassis
(I/O Racks)
I/O Capacity Communication
PLC-5/20 16K 1 resident 12
(3 I/O racks) • 512 1
• 512 inputs and 512 outputs using 16- or
32-pt modules
• 1 channel (remote I/O scanner, adapter, DH+ link)
• 1 channel DH+ link
• 1 RS-232, RS-422, RS-423 serial port
PLC-5/20E 16K 1 resident 12
(3 I/O racks) • 512 1
• 512 inputs and 512 outputs using 16- or
32-pt modules
• 1 channel (remote I/O scanner, adapter, DH+ link)
• 1 channel DH+ link
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel Ethernet
PLC-5/20C15 16K 1 resident 12 (3 I/O racks) • 512 1
• 512 inputs and 512 outputs using 16- or
32-pt modules
• 1 channel (remote I/O scanner, adapter, DH+ link)
• 1 channel DH+ link
• 1 RS-232, RS-422, RS-423 serial port
• ControlNet
PLC-5/30 32K 1 resident 28
(7 I/O racks) • 1024 1
• 1024 inputs and 1024 outputs using16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
1Any mix of I/O

Hardware Components
Processor Comparison 1-8
PLC-5 comparison chart continued...
Processor Memory
(Words)
Local
Chassis
Remote Chassis
(I/O Racks)
I/O Capacity Communication
PLC-5/40 48K31 resident 60 2
(15 I/O racks)
• 2048 1
• 2048 inputs and 2048 outputs using 16-
or 32-pt modules
• 4 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
PLC-5/40L 48K31 resident up
to 16
extended
60 2
(15 I/O racks)
• 2048 1
• 2048 inputs and 2048 outputs using 16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel extended local I/O scanner
PLC-5/40E 48K31 resident
(16 rack
addressing
capability)
60
(15 I/O racks) • 2048 1
• 2048 inputs and 2048 outputs using 16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel Ethernet
PLC-5/40C15 48K31 resident 60
15 I/O racks • 2048 1
• 2048 inputs and 2048 outputs using 16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel ControlNet
PLC-5/60 364K 1 resident 92 2
(23 I/O racks)
• 3072 1
• 3072 inputs and 3072 outputs using 16-
or 32-pt modules
• 4 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
1Any mix of I/O
2Maximum of 32 physical devices/channel
3Maximum of 57K words per program file and 32K words per data table file

Hardware Components
Processor Comparison 1-9
PLC-5 comparison chart continued...
PLC-5 ControlNet Processors - Maximum I/O Map Entries
Processor Memory
(Words)
Local
Chassis
Remote Chassis
(I/O Racks)
I/O Capacity Communication
PLC-5/60L 364K 1 resident up
to 16
extended
64 2
(23 I/O racks)
• 3072 1
• 3072 inputs and 3072 outputs using16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel extended local I/O scanner
PLC-5/80 3.4 100K 1 resident 92 2
(23 I/O racks)
• 3072 1
• 3072 inputs and 3072 outputs using 16-
or 32-pt modules
• 4 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
PLC-5/80E 3,4 100K 1 resident 92 2
(23 I/O racks)
• 3072 1
• 3072 inputs and 3072 outputs using 16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel Ethernet
PLC-5/80C15 3.4 100K 1 resident 92 2
(23 I/O racks)
• 3072 1
• 3072 inputs and 3072 outputs using 16-
or 32-pt modules
• 2 channels (remote I/O scanner, adapter, DH+ link)
• 1 RS-232, RS-422, RS-423 serial port
• 1 channel ControlNet
1Any mix of I/O
2Maximum of 32 physical devices/channel
3Maximum of 57K words per program file and 32K words per data table file
4Maximum of 64K words total data table space
Phase 1.0/1.25 Phase 1.5
Processor Number of
Mappings:
Number of
DIF
Files:
Number of
DIF
Words:
Number of
DOF
Files:
Number of
DOF
Words:
Processor Number of
Mappings:
Number of
DIF
Files:
Number of
DIF
Words:
Number of
DOF
Files:
Number of
DOF
Words:
PLC-5/20C 64 11000 11000 PLC-5/20C 64 22000 22000
PLC-5/40C 64 11000 11000 PLC-5/40C 96 33000 33000
PLC-5/80C 64 11000 11000 PLC-5/80C 128 44000 44000

Hardware Components
1771 I/O Chassis 1-10
1771 I/O Chassis for PLC-5 Family
Processors
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Catalog Number Chassis Size Mounting
Backpanel 19” Rack
Power Supply Socket
1771-A1B 4-slot Xleft
1771-A2B 8-slot Xleft
1771-A3B 12-slot X X top
1771-A3B1 12-slot Xleft
1771-A4B 16-slot Xleft
When using these processors with the
1771-A1, A2, and A4 chassis:
Only this mode of addressing is
supported:
Classic PLC-5 processors 2-slot and 1-slot in the local rack
Enhanced and Ethernet PLC-5 processors 2-slot addressing
ControlNet PLC-5 processors 2-slot addressing

Hardware Components
Power Supply Modules 1-11
Power Supply Modules in a Chassis
(containing a PLC-5 processor)
Output
Current Output Current (in amps) when Parallel with: Power Supply
Power Supply Input Power (in Amps) P3 P4 P4S P4S1 P5 P6S P6S1 Location
1771-P3 120V ac 3 6 11 11 slot
1771-P4 120V ac 811 16 16 slot
1771-P4S 120V ac 811 16 16 slot
1771-P4S1 100V ac 816 slot
1771-P4R 120V ac 8, 16, 24 2slot
1771-P5 24V dc 816 slot
1771-P6S 220V ac 816 slot
1771-P6S1 200V ac 816 slot
1771-P6R 220V ac 8, 16, 24 2slot
1771-P7 120/220V ac 16 external 1
1771-PS7 120/220V ac 16 external 1
1You cannot use an external power supply and a power supply module to power the same chassis; they are not compatible.
2See publication 1771-2.166 for more information.

Hardware Components
Power Supplies 1-12
Power Supplies in a Remote Chassis (1771-ASB)
or an Extended Local I/O Chassis (1771-ALX)
Output Current Output Current (in amps) when Parallel with: Power Supply
Power Supply Input Power (in Amps) P3 P4 P4S P4S1 P5 P6S P6S1 Location
1771-P3 120V ac 3 6 11 11 slot
1771-P4 120V ac 811 16 16 slot
1771-P4S 120V ac 811 16 16 slot
1771-P4S1 100V ac 816 slot
1771-P4R 120V ac 8, 16, 24 2 slot
1771-P5 24V dc 816 slot
1771-P6S 220V ac 816 slot
1771-P6S1 200V ac 816 slot
1771-P6R 220V ac 8, 16, 24 2 slot
1771-P1 120/220V ac 6.5 external 1
1771-P2 120/220V ac 6.5 external 1
1771-P7 120/220V ac 16 external 1
1771-PS7 120/220V ac 16 external 1
1777-P2 120/220V ac 9external 1
1777-P4 24V dc 9external 1
1You cannot use an external power supply and a power supply module to power the same chassis; they are not compatible.
2See publication 1771-2.166 for more information.

Hardware Components
Keyswitch 1-13
Front Panel Keyswitch
Keyswitch Position
Operation RUN PROG REM
RUN PROG
Execute programs (with outputs enabled) X X
Execute programs (with outputs disabled)
Save program to disk X X X X
Restore programs X X X
Create or delete: ladder files, SFC files, data table files X X
Edit online: ladder files and SFC files
(program files already exist)
X X X
Force live outputs X X
Prohibit processor from scanning program X X
Change operating mode using a programming device X X
Download to/from EEPROM X X
Automatically configure remote I/O X X
Edit data table values
(data table files already exist)
X X X X
Establish ControlNet connections and exchange data X X X X

Hardware Components
Processor Status File 1-14
Processor Status File
This word of the status file: Stores:
S:0 Arithmetic flags
• bit 0 = carry
• bit 1 = overflow
• bit 2 = zero
• bit 3 = sign
S:1 Processor status and flags
Bit Description
0 RAM checksum is invalid at power-up
1 processor in RUN mode
2 processor in TEST mode
3 processor in PROG mode
4 processor burning EEPROM
5 processor in download mode
6 processor has test edits enabled
7 mode select switch in REMOTE position
8 forces enabled
9 forces present
10 processor successfully burned EEPROM
11 performing online programming
12 not defined
13 user program checksum calculated
14 last scan of ladder or SFC step
15 processor running first program scan or the first scan of the next step
in an SFC

Hardware Components
Processor Status File 1-15
processor status file continued
This word of the status file: Stores:
S:7 Global status bits:
• S:7/0-7 - - rack fault bits for racks 0-7
• S:7/8-15 - - rack queue-full bits for racks 0-7
See also S:27, S:32, S:33, S:34, and S:35
S:8 Last program scan (in ms)
S:9 Maximum program scan (in ms)
S:2 Switch setting information
• bits 0 - 6 DH+ station number
• bit 11-12 are set based on the I/O chassis backplane switches
• bit 12 bit 11 = I/O chassis addressing
0 0 illegal
1 01/2-slot
0 11-slot
1 12-slot
• bit 13: 1 = load from EEPROM
• bit 14: 1 = RAM backup not configured
• bit 15: 1 = memory unprotected
S:3 to S:6 Active Node table for channel 1A
Word Bits DH+ Station #
3 0-15 00-17
4 0-15 20-37
5 0-15 40-57
6 0-15 60-77

Hardware Components
Processor Status File 1-16
processor status file continued...
This word of the status file: Stores:
S:10 Minor fault (word 1)
Bit Description
0 battery is low (replace in 1-2 days)
1 DH+ active node table has changed
2 STI delay too short, interrupt program overlap
3 EEPROM memory transfer at power-up
4 edits prevent SFC continuing; data table size changed
during program mode; reset automatically in run mode
5 invalid I/O status file
6 not defined
7 no more command blocks exist
8 not enough memory on the memory module to upload the program from the processor
9 no MCP is configured to run
10 MCP not allowed
11 PII word number not in local rack
12 PII overlap
13 no command blocks exist to get PII
14 arithmetic overflow
15 SFC action overlap
See also S:17