Spectrum Controls 1746sc-OAP8I User Manual
Publication 0300146-08 Rev. J
Isolated-Circuit Discrete Input and Output Modules
(Cat. No. 1746sc Series)
Installation Instructions
Input Module Catalog Numbers:
1746sc-IA8I Isolated-Circuit 100/120 V ac/dc Inputs (8)
1746sc-IB8I Isolated-Circuit 24 Vdc Inputs (8)
1746sc-IC8I Isolated-Circuit 48 Vdc Inputs (8)
1746sc-IM8I Isolated-Circuit 200/240 V ac/dc Inputs (8)
Output Module Catalog Numbers:
1746sc-OAP8IIsolated-Circuit 120/240 Vac Outputs (8)
Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
Preface
In addition to providing module specifications, this document tells you how
to:
™
• install your module into the SLC 500
• wire field devices to your module
• interpret your module’s LED indicators
• check for blown fuses (1746sc-OAP8I only)
• get technical assistance
Please read all the information in this publication before installing these
products. This publication assumes a full working knowledge of the relevant
programmable controller.
chassis
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Installation Instructions
Installation Instructions
Isolated-Circuit
Isolated-Circuit
Discrete Input and Output Modules
Discrete Input and Output Modules
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Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
Table Of Contents
General Information And Specifications .........................................................4
General Specifications..........................................................................................4
-IA8I Specifications, On/Off-State Voltage Range, & Circuit Diagram .............. 6
-IB8I Specifications, On/Off-State Voltage Range, & Circuit Diagram .............. 7
-IC8I Specifications, On/Off-State Voltage Range, & Circuit Diagram .............. 8
-IM8I Specifications, On/Off-State Voltage Range, & Circuit Diagram ............. 9
-OAP8I Specifications, Operating Voltage Range, & Circuit Diagram ............. 10
Important Pre-Installation Considerations.....................................................11
™
Installing Your Module Into The SLC 500
Wiring Field Devices To Your Module..........................................................14
CE Compliance Requirements ........................................................................... 15
-IA8I Wiring Diagram ........................................................................................ 17
-IB8I Wiring Diagram ........................................................................................18
-IC8I Wiring Diagram ........................................................................................19
-IM8I Wiring Diagram ....................................................................................... 20
-OAP8I Wiring Diagram ....................................................................................21
Chassis ....................................12
Interpreting Your Module’s LED Indicators..................................................21
Checking For Blown Fuses (1746sc-OAP8I only)........................................22
Getting T echnical Assistance.........................................................................23
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Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
General Information And Specifications
This module is designed exclusively to mount Allen-Bradley 1746 I/O racks
for use with Allen-Bradley SLC500 fixed and modular systems. The 1746sc-
IA8I, IB8I, -IC8I, and -IM8I feature 8 isolated-circuit inputs, each with its
own common. These modules also feature broad operating ranges for increased versatility. They are designed for use with a wide variety of input
devices, such as limit switches, float switches, selector switches, pushbuttons, and proximity switches (photo-sensors). They can even monitor
relay or motor starter outputs directly.
The 1746sc-OAP8I provides 8, triac-controlled, isolated-circuit outputs,
each with its own common. The module also provides a broad operating
range for increased versatility. It is designed for use with high inductive
loads, such as solenoids, relays, and motor starters. Unlike relay outputs,
triac outputs do not require back-EMF surge suppression for many inductive
loads. A triac output module is also a good replacement for a relay output
module when solid-state speed and reliability are desired.
General Specifications-- 1746sc Series
Isolation Voltage 1500 Vac point-to-point
1500 Vac field wiring-to-backplane
Environmental Conditions
Operational Temperature 0° to 60°C (32° to 140°F)
Storage Temperature -40° to +85°C ( -40° to 185°F)
Relative Humidity 5 to 95% (non-condensing)
Certifications UL/C-UL (Class I, Div 2, Groups ABCD)
Conductors Wire Size 14 gage stranded maximum
Category 1
Field Wiring Terminal Block Red, removable (A-B part 1746-RT25R)
➀
Use this conductor-category information for planning conductor routing as described in Allen-Bradley’s
system-level
Installation and Operation Manual
CE per Council Directives 89/336/EEC for EMC
and 73/23/EEC for Low Voltage
3/64 inch insulation maximum
.
➀
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Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
As noted in the previous table, these 1746sc-Series modules provide 1500 V
point-to-point isolation. This point-to-point isolation means:
• shorts, overloads, or noise on one circuit won’t affect devices on other
circuits.
• different power sources can be connected to the same module without
damaging components due to excessive voltage differences between points.
• interposing relays aren’t needed to achieve these benefits, saving space and
simplifying installation.
The 1746sc-OAP8I provides some additional benefits:
• each output circuit is individually fuse protected.
• blown fuses are indicated to the user through an LED and to the logic
controller through the logic controller’s input image table. This allows for
fuse monitoring and smart power-down sequencing of equipment after a
circuit failure.
For more information on the benefits of isolated circuits and other features of
the 1746sc-Series modules, call your local distributor or Spectrum Controls
(425-746-9481).
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Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
1746sc-IA8I Specifications
Number of Inputs 8
Points per Common 1 (individually isolated)
Voltage Category 100/120 Vac @ 50/60 Hz
100/120 Vdc, sink or source
Operating Voltage 80 to 150 Vac @ 47 to 63 Hz
85 to 170 Vdc
Nominal Input Current 16 mA @ 120 Vac, 60 Hz
Input Inrush Current (maximum) 0.7 A @ 120 Vac
Input Signal Delay (maximum)
Off to On 17 ms @ 120 Vac
On to Off 45 ms @ 120 Vac
Off-State Current (maximum) 4 mA @ 20 Vac
Power Dissipation (maximum)
Watts per point
Total watts
➁
➂
0.5 W @ 120 Vac/dc; 0.75 W @ 150 Vac/dc
4 W @ 120 Vac/dc; 6 W @ 150 Vac/dc
Backplane CurrentDraw (max.) 5 V 0.110 A
24 V 0.0 A
➀
Maximum allowable leakage current from an input device in an off state.
➁
Maximum with 1 input turned on.
➂
Maximum with all 8 inputs turned on (100% duty cycle).
2.5 mA @ 120 Vdc
7 ms @ 120 Vdc
40 ms @ 120 Vdc
➀
0.5 mA @ 20 Vdc
1746sc-IA8I On/Off-State Voltage Range
0 Vac*
0 Vdc
Off-State Input State Not Guaranteed On-State
* Frequency = 47 to 63 Hz
30 Vac*
20 Vdc
80 Vac*
85 Vdc
1746sc-IA8I Circuit Diagram (one circuit shown)
VAC/VDC +
IN –
249 Ω
24.3 kΩ
0.33 µF
24.3 kΩ
6
150 Vac*
170 Vdc
Installation Instructions
Isolated-Circuit
Discrete Input and Output Modules
1746sc-IB8I Specifications
Number of Inputs 8, sink or source
Points per Common 1 (individually isolated)
Voltage Category 24 Vdc
Operating Voltage ±11.5 to 32 Vdc
Nominal Input Current 12 mA @ 24 Vdc
Input Signal Delay (maximum)
Off-State Current (maximum) 1.8 mA @ 4.5 Vac
Power Dissipation (maximum) 6.6 W @ 240 Vac/dc
Backplane CurrentDraw (max.) 5 V 0.110 A
➀
Maximum allowable leakage current from an input device in an off state.
➁
Maximum with 1input turned on.
➂
Maximum with all 8 inputs turned on (100% duty cycle).
Off to On 0.5 ms @ 24 Vac
On to Off 1 ms @ 24 Vac
Watts per point
Total Watts
➂
➁
0.4 W @ 24 Vdc; 0.6 W @ 32 Vdc
3 W @ 24 Vdc; 4.8 W @ 32 Vdc
24 V 0.0 A
➀
1746sc-IB8I On-Off-State Voltage Range
0 Vdc 4.5 Vdc 11.5 Vdc 32 Vdc
Off-State Input State Not Guaranteed On-State
1746sc-IB8I Circuit Diagram (one circuit shown)
VDC +
IN –
1.91 Ω
3.16 kΩ
1.91 kΩ
7
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