Allen-Bradley Mini-PLC-2/15 Setup guide

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Bulletin 1772 Mini-PLC-2/15
Programmable Controller
Assembly and Installation Manual
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Introduction 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PC
Definition 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fundamental Concepts 11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PreAssembly
& Installation 12. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Controller Components 21. . . . . . . . . . . . . . . . . . . . . . . . . . .
General 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Power Supply 23
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Chassis 27
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MiniPLC2/15 Processor 28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input/Output Modules 211
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Industrial Terminal 214
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UserSupplied
Equipment 214. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Assembly and Installation 31. . . . . . . . . . . . . . . . . . . . . . . . .
General 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System
Installation Recommendations 31. . . . . . . . . . . . . . . . . . . . .
General Grounding Information 38
. . . . . . . . . . . . . . . . . . . . . . . . . .
Chassis PreAssembly 311
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O Chassis and Power Supply Mounting 317
. . . . . . . . . . . . . . . . . . .
I/O Chassis Assembly 318
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring/Cabling
Installation 325. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Incoming AC Wiring Guidelines 333
. . . . . . . . . . . . . . . . . . . . . . . . . .
Industrial T
erminal Installation 337. . . . . . . . . . . . . . . . . . . . . . . . . . .
System Start-Up 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Start-Up 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checkout Before Applying Power 41
. . . . . . . . . . . . . . . . . . . . . . . .
Checkout With Power Applied To Selected Devices 42
. . . . . . . . . . .
Checkout
of Machine Motion 47. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and Troubleshooting 51. . . . . . . . . . . . . . . . . . .
General 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Preventive Maintenance 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spare Parts 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 51
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Power Supply 52
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mini-PLC-2/15 Processor 511
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1771
I/O Modules 514. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
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Table of Contentsii
Specifications 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mini-PLC-2/15 Processor 61
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Power Supply 62
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I/O
Equipment 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Industrial Terminal 63
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 1
11
Introduction
The Bulletin 1772 Mini-PLC-2/15 Programmable Controller is a digital,
electronic, solid state industrial programmable controller capable of monitoring
and controlling up to 128 I/O devices. The Controller has a Processor, a power
supply and a number of user-selected I/O Modules chosen for the number and
type of I/O devices in the user’s application. By selecting the appropriate
modules, the user can assemble a complete programmable controller system to
meet the application requirements.
The Processor and the selected I/O Modules are housed in a single I/O Chassis,
which can be mounted inside an enclosure with a working depth of 8 inches.
A programmable controller (PC) is a solid state logic control device used for
industries as diverse as petrochemical, food processing, pulp and paper, mining,
steel and metals, and cement to name a few.
As the term “programmable” implies, PC memory can be readily changed to
meet application needs.
The Controller continuously monitors the status of devices connected as inputs.
Based on input device status and the User Program, the Controller controls the
devices connected as outputs. These input and output devices may be of
different types with various voltage and current ranges. They may include:
limit, float, selector, and pressure switches
pushbutton switches
thumbwheel switches
alarms, indicators, and annunciator panels
solenoids
motors and motor starters
transducers
various solid state devices, including TTL and Analog instrumentation
General
PC Definition
Fundamental Concepts
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Introduction
Chapter 1
12
The Processor stores all I/O device status data in a central read/write memory.
This allows the latest status data to be accessible during the scanning of the user
program. PC programming instructions allow the Processor to perform:
Timing/Counting operations
Arithmetic (+, -, x, :) operations
Data transfers and comparisons
Program Jumps/subroutines
Word/File transfers
Sequencer operations
Block transfer operations
Data highway communication
The Mini-PLC-2/15 Programmable Controller uses readily understandable
symbols in a ladder diagram format. The ladder diagram program is manually
entered into memory using an Industrial Terminal. An Industrial terminal is
also used to edit the program and monitor the status of the user’s I/O devices as
well as interface the Mini-PLC-2/15 Processor with a peripheral device.
Peripheral devices including keyboards/printers, the Digital Cassette Recorder
(Cat. No. 1770-SA) and the Data Cartridge Recorder (Cat. No. 1770-SB) allow
a variety of additional capabilities:
loading/storing/verifying the program using magnetic tape
generating a hard-copy printout of the ladder diagram program or total
memory
generating various types of reports in a user-programmed format
Indicators on the various Controller components are used to show I/O device,
Processor, and power supply status. These indicators help to diagnose a fault
situation quickly when troubleshooting the PC system.
Read this manual carefully before assembling or installing any component. It is
strongly recommended that the hardware and installation personnel work
closely with the Mini-PLC-2/15 programmer at start-up.
Certain aspects of the programmable controller may be new to many
individuals. For this reason, Publication SG1-1.1, “Application Considerations
for Solid State Controls” should be read, as it provides general background
information on solid state controls.
WARNING: To avoid personal injury and equipment damage,
completely read and thoroughly understand the contents of this
Manual before attempting to assemble and install the Mini-PLC-2/15
Controller and/or any of its components.
PreAssembly & Installation
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Chapter 2
21
Controller Components
The Mini-PLC-2/15 Programmable Controller (Figure 2.1) is made up of the
following major components:
System Power Supply(Cat. No. 1771-P1)
I/O Chassis (Cat. No. 1771-A1, -A2 or -A4)
Mini-PLC-2/15 Processor Module (Cat. No. 1772-LV)
A number of Bulletin 1771 I/O Modules.
Each of these components and their associated cables must be specified by the
user when ordering the Mini-PLC-2/15 Programmable Controller. This section
will identify and describe the hardware associated with each of these Mini-PLC-
2/15 Controller components. This will enable the user to assemble and install
the components as described in Chapter 3. For additional information, refer to
the respective Product Data Sheet for the component.
General
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Controller Components
Chapter 2
22
Figure 2.1
MiniPLC2/15
Programmable ControllerComponents
32 I/O 64 I/O 128 I/O
I/O Module
Field Wiring
Arm
I/O Power Cable
(Cat. No. 1771CL or CM)
Battery
Pack
(Cat. No.
1771BB)
System Power
Supply
MiniPLC2/15 Processor
(Cat. No. 1772LV)
I/O Chassis Assembly
(Cat. No. 1771A1, A2, A4)
(Cat. No. 1771P1)
10104-I
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Controller Components
Chapter 2
23
The System Power Supply (Cat. No. 1771-P1) is the required power source for
the Mini-PLC-2/15 Controller (Figure 2.1). It converts the incoming AC
voltages into the proper DC voltages to power the Processor and I/O Modules.
The System Power Supply can operate on either 120V AC or 220/240V AC. It
provides a regulated output of 5.1V DC to power the logic circuitry of the
Processor and I/O Modules. It also provides 5V DC for the memory circuitry of
the Processor module.
The 5.1V output provides a maximum current of 6.5 amperes for the Processor
and I/O Modules. Thus, the current requirements of the selected I/O Modules
and Processor Module added together cannot exceed 6.5 amperes. The current
requirements for available modules are listed in Table 1.A.
The System Power Supply is protected against undervoltage, overvoltage and
overcurrent conditions. it constantly monitors the incoming AC voltage for
proper levels (98 to 132V AC for 120V AC operation; 196 to 250V AC for
220/240V AC operation). The power Supply allows some margin for variation
from this normal voltage range. There is a minimum voltage of 92V for 120V
AC operation and 184V for 220/240V AC operation. if the AC line voltage
drops below the minimum voltage for more than one-half cycle, the Power
Supply signals the Processor to stop communication with the I/O Modules
before invalid I/O data is transmitted. Once the correct AC level returns,
communication with the I/O Modules is re-established.
Figure 2.2
System
Power Supply
Battery Pack
(Cat. No. 1771BB)
10694I
System Power Supply
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Controller Components
Chapter 2
24
Battery Pack
The Battery Pack (Cat. No. 1771-BB) is shipped standard with the System
Power Supply and consists of:
A metal Battery Housing (Cat. No. 1771-BH)
A mounting Hardware Set (Cat. No. 1771-BX)
Two D-size alkaline batteries (Cat. No. 1771-BA)
An optional lithium battery (Cat. No. 1770-XO) can be ordered for use with the
Battery Pack, is preferred.
The Battery Pack provides a convenient form of RAM memory backup power
to the Processor when power from the System Power Supply is interrupted. It
provides this memory backup power when the Processor is seated in the
left-most slot of the I/O chassis. An external Battery Pack can also maintain
memory content when the Processor is removed from the I/O Chassis. This is
done by connecting them together with the Mini-Processor Transport Cable
(Cat. No. 1772-CD) as shown in Figure 2.3.
I/O Power Cable
An I/O Power Cable (Figure 2.1) is used to connect the System Power Supply
and the Battery Pack to the I/O Chassis. To accommodate two Power Supply
mounting configurations, this cable is available in two lengths:
Cat. No. 1771-CL I/O Power Cable (1 ft/30.5 cm)
Cat. No. 1771-CM I/O Power Cable (5 ft/1.5 m)
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Controller Components
Chapter 2
25
Table 1.A
Module Reference Chart
Module Cat. No.
Module's
Load on
System
Power
Supply
Keying Band
Positions
Between Nos.
Field
Wiring Arm
(Cat. No.
1771 )
Color
Coded
Label
AC/DC (120V) Input
DC (1224V) Input
DC (48V) Input
Isolated AC/DC (120V) Input
Analog (8 bit) Input
Analog (12 bit) Input
1771IA
1771IB
1771IC
1771ID
1771IE
1771IF
74mA
74mA
74mA
50mA
400mA
1.3A
46, 1012
46, 1416
46, 1618
46, 2830
46, 2630
68. 2224
46, 3234
WA
WA
WA
WD
WB
WB
WB
Red
Blue
Blue
Red
Pink
Pink
Pink
TTL Input
DC (2428V) Input
Encoder/Counter (5V)
1771IG
1771IH
1771IJ
122mA
74mA
1.4A
46, 3436
46, 1618
68. 1820
46, 3234
WC
WA
WB
WB
Pink
Blue
Brown
Brown
Encoder/Counter (1224V) 1771IK 1.4A 68, 2022
46, 3234
WB
WB
Brown
Brown
AC/DC (220/240V) Input
DC (530V) Selectable Input
Fast Response DC (1224V)
Input
DC (1224V) Driver Logic Input
Thermocouple Input
1771IM
1771IQ
1771IT
1771IV
1771IX
75mA
150mS
74mA
74mA
2.0A
68, 3032
68, 2426
68, 3234
810, 1214
810, 1820
810, 2022
WA
WC
WA
WA
WE
Red
Blue
Blue
Blue
Blue
Pink
Thermocouple Input Expander
AC (120V) Output
DC (1224) Output
DC (48V) Output
Isolated AC (120V) Output
Analog (12 bit) Output
1771IY
1771OA
1771OB
1771OC
1771OD
1771OF
500mA
210mA
165mA
165mA
225mA
1.4A
810, 2022
46, 1214
46, 1820
46, 2022
46, 3032
24, 68
46, 3234
WE
WA
WA
WA
WD
WB
Pink
Orange
Green
Green
Orange
Yellow
Yellow
TTL Output
AC (220/240V) Output
Contact Output
Gray Encoder Input (8 bit)
MiniPLC2/15 Processor
Communication Adapter
Communication Controller
Communication Controller
Data Highway Interface/Modem
Modem Interface
1771OG
1771OM
1771OY
1771DL
1772LV
1771KA
1771KC
1771KD
1771KF
1771KG
168mA
225mA
420mA
120mA
2.0A
1.2A
1.2A
1.2A
1.2A
1.0A
68, 1012
68, 2830
68, 1618
46, 2426
4042, 5456
46, 2224
68, 1214
46, 2224
WC
WA
WD
WB
Gray
Orange
Orange
Brown
AC Input Fuse
A slow-blow fuse (Figure 2.2) is used to guard against overcurrent conditions
on the AC input line. The Power Supply is shipped with a 1-amp fuse in the
fuse holder for 120V operation. For 220/240V operation, a 0.5-amp fuse is
required and is included with the Power Supply.
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Controller Components
Chapter 2
26
Terminal Strip
AC input connections are made to the terminals on the Power Supply labeled L1
and L2. L1 is the high side of the AC line and L2 is the low side (Figure 2.2).
Power
Supply Indicators
The two indicators on the front of the System Power Supply (Figure 2.2) are:
DC ON
BATTERY LOW
The red DC ON indicator illuminates when the System Power Supply is
operating properly; that is, the AC line voltage and DC output voltages are
within their normal ranges. If this indicator is OFF, the incoming AC voltage
may be low, the AC line fuse may have blown, or the Power Supply may have
overloaded or been shorted.
Figure 2.3
External
Battery Backup
Battery Pack
(Cat. No. 1771-BB)
MiniPLC2/15 Processor
(Cat. No. 1772LV)
MiniPLC2/15 Processor
Transport Cable
(Cat. No. 1772CD) 10105-I
In some “brownout” situations, it is possible that the DC ON indicator might be
illuminated while the Processor is disabled. This is because the Power Supply
can supply the output voltage to maintain Processor logic, even through the AC
line voltage has dropped below the normal range.
The BATTERY LOW indicator flashes when the Battery Pack voltage is low,
the batteries are not installed or they have been installed with incorrect polarity.
At this level, the batteries can support Processor memory for approximately one
week, however memory content should be checked and reentered if necessary.
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Controller Components
Chapter 2
27
Optional Power Supply Source
It is permissible to use the 1771-P2 Auxiliary Power Supply in place of the
1771-P2 System Power Supply. It should be noted, however, that RAM
memory will be lost if an AC power loss occurs. One of two cables is used with
this power supply:
1771-CE Power Cable (1 ft/30.5 cm)
1771-CD Power Cable (5 ft/1.5 m)
The I/O Chassis is the compact, slotted until that houses the Mini-PLC-2/15
Processor Module and the I/O Modules. There are three I/O Chassis sizes
available (Figure 2.4):
32 I/O Chassis (Cat. No. 1772-A2), containing 4 I/O Module slots
64 I/O Chassis (Cat. No. 1771-A2), containing 8 I/O Module slots
128 I/O Chassis (Cat. No. 1771-A4), containing 16 I/O Module slots
Each I/O Chassis is able to fit into a working enclosure eight inches deep.
I/O Chassis are designed to permit Controller expansion. If a 32 I/O or 64 I/O
Chassis is used and more I/O points are needed, a larger Chassis can be installed
without rewiring. User wiring is connected to Field Wiring Arms which can be
removed from the smaller Chassis and snapped onto the corresponding positions
of the larger Chassis. Also, when Field Wiring Arms and I/o modules are
placed in corresponding slots on the larger Chassis, the originally programmed
addresses of the user I/O device are still valid and need not be changed.
The backplane of the Chassis has sockets for each module, a socket for Power
Supply connection and a Switch Group Assembly for determining output
response to a fault. latches on top of the Chassis snap down to hold the modules
securely in place and provide labeling for module identification.
Shipped standard with each I/O Chassis are a number of Field Wiring Arms
(Cat. No. 1771-WA), one for each I/o Module slot. If special Field Wiring
Arms are required, they are shipped with the I/O Module. In addition, a
package of plastic Keying Bands (Cat. No. 1777-RK) is shipped with each I/O
Chassis. The Keying Bands provide an easy method for the user to key an I/O
Module slot to accept only one type of I/O Module. use of these keying bands
is strongly recommended.
I/O Chassis
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Controller Components
Chapter 2
28
The Mini-PLC-2/15 Processor Module (Cat. No. 1772-LV) is the central
processing unit and memory of the programmable controller. It has 2K words of
memory for the Data Table, User Program and messages. it can monitor and
control up to 128 I/O devices that are wired to I/O Modules in the I/O Chassis.
The Processor examines data from input devices, processes this data according
to the User Program, and transmits data to control the output devices. In
addition, the Processor monitors the status of its own operation, of data in
memory, and of power from the System Power Supply. Orderly shutdown is
provided if a malfunction from any of these points is detected.
The Mini-PLC-2/15 Processor (Figure 2.5) has three diagnostic indicators, a
Mode Select Switch, an INTERFACE port and an EPROM access door. In
addition,the Processor has a memory write protect feature that is active when a
programmed EPROM is in place in the Processor.
Figure 2.4
I/O
Chassis Sizes
10106-I
32 I/O 64 I/O 128 I/O
Switch Group
Assembly
Backplane Sockets
Power Supply Socket
Diagnostic I ndicators
There are three diagnostic indicators on the front of the Processor to show the
status of its operation (Figure 2.5). They are:
PROCESSOR - When the Mode Select Switch is in the TEST, RUN or
RUN/PROG position, this red indicator illuminates if a hardware fault in the
Processor occurs or the Processor cannot scan the memory.
MEMORY - In the TEST, RUN or RUN/PROGRAM mode, this red
indicator illuminates if the Mini-PLC-2/15 Processor detects no user
MiniPLC2/15 Processor
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Controller Components
Chapter 2
29
memory, a discrepancy in memory data, or a parity error. This indicator is
normally OFF.
In the PROGRAM mode this red indicator is used during EPROM
programming. While EPROM programming is in progress, this indicator will
blink ON and OFF. When EPROM programming has been successfully
completed without error, this indicator will stay OFF. If an error in EPROM
programming occurs, this indicator will come ON and stay ON.
This indicator will also flash if EPROM transfer at power-up is bad.
RUN - This green indicator illuminates when the Mini-PLC-2/15 Processor
is operating with the Mode Select Switch in the RUN or RUN/PROG
position and the outputs are enabled.
Figure 2.5
MiniPLC2/15
Processor
10695bI
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Controller Components
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210
Mode Select Switch
The Mode Select Switch (Figure 2.5) places the Processor in one of four
operating modes:
PROG - This switch position places the Processor into the PROGRAM mode
of operation. The User Program instructions are entered into memory in this
switch position. EPROMs are programmed in this mode. All output devices
are disabled. When a programmed EPROM is already in place, this mode is
limited by the Memory Write Protect feature. See section titled Memory
Write Protect for details.
TEST - This switch position allows the User Program to be tested by
enabling inputs but not outputs. This allows debugging of the User Program.
RUN - This switch position allows the Processor to scan and execute the
User Program. Changes to the Data Table or User Program are not permitted
in this switch position. Output devices will be energized according to the
User Program.
RUN/PROG - This switch position allows the Processor to function as it does
in the RUN position. On-line changes to the Data Table or User Program are
permitted in this switch position. When a programmed EPROM is already in
place, this mode is limited by the Memory Write Protect feature. See section
titled Interface Socket for details.
When the keyswitch is in the RUN/PROG position, the Processor can be placed
in one of three remote modes from the 1770-T3 Industrial Terminal keyboard:
REMOTE RUN/PROGRAM - the default mode. When the keyswitch is
turned to the RUN/PROG position, the Processor automatically enters this
mode. On-line changes to the program and Data Table are allowed in this
mode. When a programmed EPROM is already in place, this mode is limited
by the Memory Write Protect feature. See section titled Interface Socket for
details.
REMOTE PROGRAM - identical to the PROGRAM mode. The program
scan and I/O scan will be halted. All outputs are disabled. Going into this
mode from REMOTE RUN/PROGRAM will reset an I/O fault, and clear a
memory parity error.
REMOTE TEST - identical to the TEST mode. The program scan will be
running, but all outputs are disabled. Going into this mode from REMOTE
RUN/PROGRAM will reset an I/O fault as does physically changing the
keyswitch position from RUN/PROG or RUN to TEST.
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Controller Components
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211
INTERFACE Socket
The 15-pin socket labeled INTERFACE is used in connecting the Processor to
the Industrial Terminal (Cat. No. 1770-T3) for programming, report generation
or monitoring. This socket is also used to connect an external Battery Pack to
the Processor so the Processor can be removed from the I/o Chassis without loss
of memory. When programming an EPROM this INTERFACE socket is used
to connect the 25.5V Power Supply to the Processor.
EPROM
Access Door
The EPROM Access Door on the side of the Processor covers a 28-pin EPROM
socket, which is used to house an optional 24-pin EPROM memory chip
(Erasable Programmable Read Only memory) (Cat. No. 1770-XP). The
EPROM provides the user with a 2K word non-volatile memory backup system.
Programmed EPROMs can be erased with an ultraviolet light as described in
Publication 1770-915, EPROM Programming.
Memory
W rite Protect
When a programmed EPROM is in place in the Processor, a Memory Write
Protect feature becomes active. This means values from word address 2008 to
the end of memory are protected and cannot be altered by programming.
The I/O Modules (Figure 2-6) contain the necessary circuitry to interface the
user’s I/O devices to the Mini-PLC-2/15 Processor.
Each I/O circuit has optical isolation to guard against high-voltage transients
that can damage the Mini-PLC-2/15 Controller’s logic circuitry. Optical
isolation is rated at 1500V RMS.
Many Input Modules have filtering circuitry to suppress contact bounce and to
guard against recognition of transients as data.
Most I/O modules have indicators that show the ON/OFF status of each input or
output device connected to it. These indicators are useful during start-up,
monitoring, and troubleshooting. Output modules with fuses also have an
additional indicator that illuminates if an output fuse in the module has blown.
I/O modules are available for devices with different voltage levels and
characteristics. A color-coded label on each I/O module identifies the general
type of module and voltage range. Table 1.A lists the general information on
each I/O Module and the Processor Module. The Product Data Sheets for the
I/O Modules include a detailed description, Module specifications, connection
diagrams and keying information.
Input/Output Modules
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Controller Components
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212
Figure 2.6
Typical
Input and Output Modules
(a) Output Module (b) Input Module 10841I
Field W iring Arms
Wiring to and from user I/O devices connects to a separate Field Wiring Arm
for each I/O module. The Field Wiring Arm is a terminal strip that pivots up
and down for quick, easy insertion and removal of I/O modules (Figure 2.7)
without disturbing filed wiring. This aids in start-up and troubleshooting by
shortening the time needed to replace I/O modules, thus decreasing down-time.
Cat. No. 1771-WA Field Wiring Arms are shipped with the I/O Chassis (one for
each I/O Module slot). This Field Wiring Arm is used with most I/O modules.
if a certain module requires a different Field Wiring Arm, it is shipped with that
module. In this case, use the Field Wiring Arm that comes with the module.
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Controller Components
Chapter 2
213
I/O Addressing
Each terminal on a Field Wiring Arm is identified by a 5-digit address
(Figure 2.8). The 5 digits in the terminal address directly correspond to a
memory location in the Processor’s Data Table and designate the following:
The first digit is either a 0 for outputs or a 1 for inputs.
The second digit refers to the Rack Number (always 1 for the Mini-PLC-2/15
System).
The third digit refers to the Module Group Number (0-7). A Module Group
consists of two adjacent I/O Module slots in the I/O Chassis starting at the
left (Figure 2.9). The Module Group Numbers for each pair of I/O slots are
identified on labels on the Chassis latches.
The fourth and fifth digits of the address refer to the Terminal number within
the Module Group (00-07, 10-17).
Figure 2.7
Field
W iring Arms
10767I
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Controller Components
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214
The Industrial Terminal System (Cat. No. 1770-T3) is used to enter, monitor,
edit and troubleshoot the User Program in the memory of the Mini-PLC-2/15
Processor (Figure 2.10). In addition, it can be used for report generation or to
interface peripheral devices to the Processor.
The 1770--T1 or -T2 Industrial Terminals can be used with the Mini-PLC-2/15
Processor, however, they will limit the capabilities of the Processor. When
using the 1770-T1 or -T2 Industrial Terminal, the Mini-PLC-2/15 Processor will
be limited in the following ways:
Up to 256 word Data Table
Up to 104 Timers/ Counters
I/O forcing in one Module Group at a time
Mini-PLC-2 processor instruction set
Figure 2.8
Fivedigit
Address
01012
Output=0
Input = 1
Rack Number,
Always 1 for
Mini-PLC-2/15
Module Group Number (0-7)
Terminal Number (00-07, 10-17)
10107-I
In addition to Mini-PLC-2/15 Controller components, the user can supply other
equipment for Controller installation including:
An enclosure, for mounting the Controller and shielding it from noise and
airborne contaminants
Emergency-Stop switches, variable in type and number
Master Control Relay, to enable and disable I/O power by manual control
Disconnects, normally a part of any electrical installation
Isolation transformers or constant voltage transformers, as application needs
dictate
User power supplies, for I/O devices not powered directly from the AC line
Suppression devices, for noise-generating equipment, including inductive
loads in series with hard contacts
Industrial Terminal
UserSupplied Equipment
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