Allen-Bradley 1791-16BC User manual

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16 Input/16 Output

DC Block I/O Module

Cat. No. 1791-16BC Series B

Installation

Mount the block I/O module in a vertical (recommended) or horizontal position.

Allow sufficient room around the block for cooling air to flow through the block

module. Refer to Figure 1.

Figure 1

Mounting

Dimensions for the Block I/O Module

Cat.

No. 1791–16BC (PLC version shown)

mounting holes

for 1/4–inch screws

4.35

(110.5)

3.35

(85.1)

6.95

(176.5)

6.60

(167.6)

0.5

(12.7)

6.95H x 4.35W x 3.85D

(176.5H x 1

10.5W x 98D)

Inches

(Millimeters)

Equipment

Grounding Stud

CAUTION:

When tightening grounding

stud nut, do not exceed 15 in-lbs.

Block

Operating temperature

in air gap below

module must not

exceed 60

C (140

oF).

2.0 (50.8) air gap

on all 4 sides.

1791-16BC

24V

dc IN/OUT

IN OUT

OUT G

COMM

STATUS

RACK #

 

Dimensions

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

Figure 2

Mounting

on a DIN Rail

1. Hook

top of slot over DIN rail.

2. While pressing block against rail, pull

down on locking levers.

When block is flush against rail, push up

on locking levers to secure block to rail.

Locking levers

DIN Rail

A-B Pt. No. 199-DR1

46277-3

EN 50022

(35 x 7.5mm)

Figure 3

Inserting

Labels

set of labels is supplied with your module.

Select the proper module designation labels

(PLC or SLC) for the front door and

terminal strips.

Remove die-cut labels from package.

Select correct labels for your application.

(PLC label is numbered 00–07 and 10–17.

SLC is numbered 00–07 and 08–15.)

Open clear front door

. Insert module

designation label into slots in door

Remove plastic cover on terminal strip

by flexing in middle. Slip terminal

designation label with power and RIO

designations into built-in holders in left

terminal strip cover

. Flex cover slightly

to install. Repeat for the other

terminal strip using the remaining label.

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

able

Acceptable

iring Cables for Block I/O Connection

Use Cable Type

Remote I/O link Belden 9463

Input and output wiring Up to 14AWG (2mm2) stranded with 3/64 inch insulation

Connect wiring as shown in Figure 4 or Figure 5.

Figure 4

Wiring

Connections with PLC Family Programmable Controllers (refer

to T

able B)

RIO

PLC

GND

BLU

CLR

in 01

in 02

in 03

in 04

in 05

in 06

in 07

NOT

USED

SHD

NOT

USED

+24

RET

+24

24V dc

+–

RET

NOT

USED

RET

NOT

USED

––

in 10

in 12

in 13

in 14

in 15

in 16

in 17

NOT

USED

out 00

out 01

out 02

out 03

out 04

out 05

out 06

out 07

out 10

out 12

out 13

out 14

out 15

out 16

out 1

out 17

NOT

USED

NOT

USED

CONN

CONN NO

CONN

RET

Vdc

RET

Vdc

_+_

24V dc 24V dc

24V dc

RET

1 connections are internally connected.

RET 2 connections are internally connected.

Vdc 3 connections must be externally connected together to accommodate total amperage rating.

Vdc 4 connections must be externally connected together to accommodate total amperage rating.

Output fusing is recommended. Refer to T

able C.

30 1

NOTE:

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

Figure 5

Wiring

Connections with SLC Family Processors (refer to T

able B)

RIO

SLC

GND

BLU

CLR

in 01

in 02

in 03

in 04

in 05

in 06

in 07

NOT

USED

SHD

NOT

USED

+24

RET

+24

24V dc

+–

RET

NOT

USED

RET

NOT

USED

––

NOT

USED

out

out 01

out 02

out 03

out 04

out 05

out 06

out 07

NOT

USED

NOT

USED

CONN

CONN NO

CONN

RET

Vdc

RET

Vdc

_+_

24V dc 24V dc

24V dc

out

out 09

out 10

out 1

out 12

out 13

out 14

out 15

in 08

in 09

in 10

in 1

in 12

in 13

in 14

in 15

RET

1 connections are internally connected.

RET 2 connections are internally connected.

Vdc 3 connections must be externally connected together to accommodate total amperage rating.

Vdc 4 connections must be externally connected together to accommodate total amperage rating.

Output fusing is recommended. Refer to T

able C.

NOTE:

The block I/O module has an equipment grounding stud on the lower left side of

the module. Connect this grounding stud to your equipment ground. Torque the

nut to 15 in-lbs maximum when connecting to your equipment ground.

ATTENTION: Do not overtighten the nut on the grounding stud

when connecting the wire. Damage to the module could result.

Refer to “Programmable Controller Wiring and Grounding Guidelines”

(1770-4.1) for further information.

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

able B

Wiring

Block Designations

Connections

1791–16BC Series B Connector/Terminal

onnect

ons Designation Description Left Right

+24 +24V dc Power 1

Power

Connections

RET +24 dc Return 3

Connections

GND Chassis ground 21

R t I/O

BLU Blue wire – RIO 6

Remote I/O

Connections

CLR Clear wire – RIO 8

Connections

SHD Shield – RIO 7

I/O Connections

PLC: in 00 thru 07

SLC: in 00 thru 07

PLC: Input 00 thru 07

SLC: Input 00 thru 07

16, 18, 20, 22,

24, 26, 28, 30

Input RET 1 dc input return 12, 142

Input

(G)6PLC: in 10 thru 17

SLC: in 08 thru 15

PLC: Input 10 thru 17

SLC: Input 08 thru 15

15, 17, 19, 21,

23, 25, 27, 29

RET 2 dc input return 11, 133

PLC: out 00 thru 07

SLC: out 00 thru 07

PLC: Output 00 thru 07

SLC: Output 00 thru 07

15, 13, 11, 9,

7, 5, 3, 1

Vdc 3 +24V dc output supply 19, 174

Output RET 3 dc output return 21

Output

(G)7PLC: out 10 thru 17

SLC: out 08 thru 15

PLC: Output 10 thru 17

SLC: Output 08 thru 15

16, 14, 12,

10, 8, 6, 4, 2

Vdc 4 +24V dc output supply 20, 185

RET 4 dc output return 22

Not used For internal test only;

not for customer use. 4, 5, 9, 10 29, 27, 26

No Conn No internal connection;

customer can use.

30, 28, 25,

24, 23

Connect chassis ground to equipment grounding stud. These are not internally connected.

erminals 12 and 14 are internally connected.

erminals 1

1 and 13 are internally connected.

erminals 17 and 19 must be externally connected by customer to accommodate amperage rating.

erminals 20 and 18 must be externally connected by customer to accommodate amperage rating.

IN (G) = input module group.

OUT (G) = output module group.

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SW1

SW2

Open cover to

access switches

30 1

Position = 1Position = 0

End View

87654321

0 1

87654321

0 1

ATTENTION: Cycle power to the module after

setting the switches.

Default Switch

Settings = 0

Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

Figure 6

Switch

Settings

SW2–8

Not used

SW2–7 Filter Speed Select

(Inputs only)

0 Slow

1 Fast

SW2–6 Last I/O Group

(PLC-2 only)

0 Not last rack

1 Last rack

SW2–5 Processor

Restart/Lockout (PRL)

0 Processor Restart

1 Processor Lockout

SW2–4 Hold Last State

0 Reset Outputs

1 Hold Last State

SW2–3

Set to 0

Communication Rate

SW2–2 SW2–1 Bits/s

0 0 57.6 K

0 1 115.2 K

1 0 230.4 K

1 1 230.4 K

Starting Quarter

SW1–2 SW1–1 Module Group

0 0 0 (1st)

0 1 2 (2nd)

1 0 4 (3rd)

1 1 6 (4th)

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

1747-SN

Rack

1771-SN

Rack

PLC–2

Rack

PLC–5

Rack

PLC–5/250

Rack

PLC–3

Rack

SW1 Switch Position

Number

Number 8 7 6 5 4 3

Rack

Rack 1 Rack 1

Not V

alid

Rack 0 Rack 0

0 0 0 0 0 0

Rack 1 Rack 2 Rack 2 Rack 1 Rack 1 Rack 1

0 0 0 0 0 1

Rack 2 Rack 3 Rack 3 Rack 2 Rack 2 Rack 2

0 0 0 0 1 0

Rack 3 Rack 4 Rack 4 Rack 3 Rack 3 Rack 3

0 0 0 0 1 1

Rack 5 Rack 5 Rack 4 Rack 4 Rack 4

0 0 0 1 0 0

Rack 6 Rack 6 Rack 5 Rack 5 Rack 5

0 0 0 1 0 1

Rack 7 Rack 7 Rack 6 Rack 6 Rack 6

0 0 0 1 1 0

Rack 7 Rack 7 Rack 7

0 0 0 1 1 1

Rack 10 Rack 10 Rack 10

0 0 1 0 0 0

Rack 1

1 0 0 1 0 0 1

Rack 12 Rack 12 Rack 12

0 0 1 0 1 0

Rack 13 Rack 13 Rack 13

0 0 1 0 1 1

Rack 14 Rack 14 Rack 14

0 0 1 1 0 0

Rack 15 Rack 15 Rack 15

0 0 1 1 0 1

Rack 16 Rack 16 Rack 16

0 0 1 1 1 0

Rack 17 Rack 17 Rack 17

0 0 1 1 1 1

Rack 20 Rack 20 Rack 20

0 1 0 0 0 0

Rack 21 Rack 21 Rack 21

0 1 0 0 0 1

Rack 22 Rack 22 Rack 22

0 1 0 0 1 0

Rack 23 Rack 23 Rack 23

0 1 0 0 1 1

Rack 24 Rack 24 Rack 24

0 1 0 1 0 0

Rack 25 Rack 25 Rack 25

0 1 0 1 0 1

Rack 26 Rack 26 Rack 26

0 1 0 1 1 0

Rack 27 Rack 27 Rack 27

0 1 0 1 1 1

Rack 30 Rack 30

0 1 1 0 0 0

Rack 31 Rack 31

0 1 1 0 0 1

Rack 32 Rack 32

0 1 1 0 1 0

Rack 33 Rack 33

0 1 1 0 1 1

Rack 34 Rack 34

0 1 1 1 0 0

Rack 35 Rack 35

0 1 1 1 0 1

Rack 36 Rack 36

0 1 1 1 1 0

Rack 37 Rack 37

0 1 1 1 1 1

Rack 40

1 0 0 0 0 0

Rack 41

1 0 0 0 0 1

Rack 42

1 0 0 0 1 0

Rack 43

1 0 0 0 1 1

Rack 44

1 0 0 1 0 0

Rack 45

1 0 0 1 0 1

Rack 46

1 0 0 1 1 0

Rack 47

1 0 0 1 1 1

Rack 50

1 0 1 0 0 0

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

SW1 Switch Position

PLC–3

Rack

Number

PLC–5/250

Rack

Number

PLC–5

Rack

Number

PLC–2

Rack

Number

1771-SN

Rack

Number

1747-SN

Rack

Number 345678

PLC–3

Rack

Number

PLC–5/250

Rack

Number

PLC–5

Rack

Number

PLC–2

Rack

Number

1771-SN

Rack

Number

1747-SN

Rack

Number

Rack

1 0 1 0 0 1

Rack 52

1 0 1 0 1 0

Rack 53

1 0 1 0 1 1

Rack 54

1 0 1 1 0 0

Rack 55

1 0 1 1 0 1

Rack 56

1 0 1 1 1 0

Rack 57

1 0 1 1 1 1

Rack 60

1 1 0 0 0 0

Rack 61

1 1 0 0 0 1

Rack 62

1 1 0 0 1 0

Rack 63

1 1 0 0 1 1

Rack 64

1 1 0 1 0 0

Rack 65

1 1 0 1 0 1

Rack 66

1 1 0 1 1 0

Rack 67

1 1 0 1 1 1

Rack 70

1 1 1 0 0 0

Rack 71

1 1 1 0 0 1

Rack 72

1 1 1 0 1 0

Rack 73

1 1 1 0 1 1

Rack 74

1 1 1 1 0 0

Rack 75

1 1 1 1 0 1

Rack 76

1 1 1 1 1 0

Not V

alid 1 1 1 1 1 1

Rack address 77 is an illegal configuration.

PLC-5/1

1 processors can scan rack 03.

PLC-5/15 and PLC-5/20 processors can scan racks 01–03.

PLC-5/25 and PLC-5/30 processors can scan racks 01–07.

PLC-5/40 and PLC-5/40L processors can scan racks 01–17.

PLC-5/60 and PLC-5/60L processors can scan racks 01–27.

PLC-5/250 processors can scan racks 00–37.

The SLC 500 controllers communicate with the block I/O using an I/O Scanner

module (cat. no. 1747-SN series A). Refer to the user manual for the 1747-SN/A

Scanner module for more information.

Important: This block I/O module is not compatible with the 1747-DSN

Distributed I/O Scanner module.

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Installation Instructions

Block I/O

Cat. No. 1791-16BC Series B

Termination Resistor

termination resistor must be installed on the last block in a series. Connect the

resistor as shown in Figure 7.

Figure 7

Installing

the T

ermination Resistor

Termination

Resistor

Connect

termination resistor across

terminals 6 (BLU) and 8 (CLR).

10835–I

BLU

SHD

CLR

150 ohm – 57.6K and 1

15.2K bits/s

82 ohm – 230.4K bits/s

ATTENTION: Devices

that are operating at 230.4K bits/s must have

82 ohm terminators in place for proper operation.

Indicators

PLC SLC

OUTIN

COMM

STATUS

COMM

STATUS

G G

OUTIN

G G

Indicator Description

COMM

OFF

Flashing

Communication not established

Communication established

Processor in Program mode

STATUS OFF

Flashing

Normal

Error (hardware or software), block power low

COMM F

AIL – communication cable disconnected, 100ms between valid frames, no

more than 255 valid frames between valid frames addressed to block, 20ms idle

time exceeded.

COMM

and ST

TUS will alternately flash when processor restart lockout is selected, a fault has occurred and the processor

is communicating with the block.

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