Rockwell Automation 1746-XXXX SLC 500 Digital I/O Modules Installation Instructions - Manual (Page 38)

38 SLC 500 Digital I/O Modules
Publication 1746-IN027D-EN-P - December 2012
Continuous current per point
(2)
1.0 A @ 30 °C (86 °F)
0.50 A @ 60 °C (140 °F) 0.50 A @ 30 °C (86 °F)
0.25 A @ 60 °C (140 °F) 1.0 A @ 30 °C (86 °F)
(7)
0.50 A @ 60 °C (140 °F)
Continuous current per module, max 8.0 A @ 30 °C (86 °F)
4.0 A @ 60 °C (140 °F) 8.0 A @ 30 °C (86 °F)
4.0 A @ 60 °C (140 °F) 8.0 A @
0...60 °C (32...140 °F)
On-state voltage drop, max 1.2V @ 1.0 A 1.2V @ 0.50 A 1.0V @ 0.50 A
Surge current per point
(3)
3.0 A for 10 ms 3.0 A for 10 ms 2.0 A for 10 ms
(8)
(1)
To limit the effects of leakage current through solid-state outputs, a loading resistor can be connected in parallel with your load. For transistor
outputs 24V DC operation, use a 5 K
Ω, 1/2 W resistor.
(2)
Recommended surge suppression: For transistor outputs when switching 24V DC inductive loads, use a 1N4004 diode reverse-wired across the
load. Refer to the SLC 500 Modular Hardware Style User Manual, publication
1747-UM011 , for more information on surge suppression.
(3)
Repeatability is once every 1 s at 30 °C (86 °F). Repeatability is once every 2 s at 60 °C (140 °F).
(4) Removable terminal block.
(5) Use the following ID Code when configuring your system with programming software or the HHT: 1746-OB16E = 2920.
(6)
Fast turn-off modules (1746-OB6EI, 1746-OBP8 Series B and later, 1746-OB16E Series B and later, 1746-OBP16, and 1746-OVP16) provide fast
OFF delay for inductive loads. Comparative OFF delay times for 1746-OB8/1746-OV8 and fast turn-off modules, when switching Bulletin
100-B110 (24W sealed) contactor, are: 1746-OB8/1746-OV8 OFF delay = 152 ms; fast turn-off modules OFF delay = 47 ms.
(7)
Fast off delay for inductive loads is accomplished with surge suppressors on the 1746-OB6EI, 1746-OBP8 series B and later,1746-OB16E series B
and later, 1746-OBP16, and 1746-OVP16 modules. A suppressor at the load is not needed unless another contact is connected in series. If this is
the case, a 1N4004 diode should be reverse wired across the load. This defeats the fast turn-off feature.
(8) Surge current = 32 A per module for 10 ms.
ATTENTION: A transient pulse occurs in transistor outputs when the external DC supply voltage
is applied to the output common terminals (for example, through the master control relay). This
can occur regardless of the processor having power or not. For most applications, the energy of
this pulse is not sufficient to energize the load.
Refer to the SLC 500 Modular Hardware Style User Manual, publication 1747-UM011 , for more
information on transient pulses and guidelines to reduce inadvertent processor operation.
Specifications – 1746-OB6EI, 1746-OBP8, and 1746-OBP16
Attribute Value
1746-OB6EI
(5)(6)
1746-OBP8
(5)(6)(8)
1746-OBP16
(5)(6)(9)(10)
Voltage category 24V DC Signal Output
Number of outputs 6 8 16
Points per common Individually isolated 4 16
Specifications – 1746-OB8, 1746-OB16, and 1746-OB16E
Attribute Value
1746-OB8 1746-OB16
(4)
1746-OB16E
(4)(5)