Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
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Chapter 2 Installation Instructions
A reverse voltage protection circuit makes sure that externally applied voltages
to any output channel do not generate current flow backwards into the module
outputs.
In Duplex redundant mode, the two fail-safe output switches per channel are
combined in a parallel arrangement so that they automatically form a fault-
tolerant output configuration. In this configuration, removal and of an output
module is possible without any disruption to a live system.
The module has a range of self-checking functionality. Short circuit and open
circuit line monitoring is provided on all outputs. In addition, each output
channel is tested and checked for ‘stuck-on’ and ‘stuck-off’ conditions on the
output switch pairs. The 'stuck-on'/'stuck-off' test is performed on one 1715-
OB8DE module per minute.
Field Wiring of Digital Output Termination Assemblies
The 1715-TASOB8DE and 1715-TADOB8DE consist of a simple PCB, screw
termination blocks (16 terminals), two 10A fuses with a plastic fuse cover,
coding pegs, field terminal connectors and connectors to connect the module
to the command, and response buses.
Figure 39 - 1715-TASOB8DE and 1715-TADOB8DE Digital Output Termination Assemblies
TEST
Ov V1+ Ov V2+ Ov V1+ Ov V2+
CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7
TB1 TB2 TB3 TB4
J1
FH1
FH2
TB1
TB2
TB3
TB4
J1
J2
c
c
Ov
CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7
V1+
Ov V1+
Ov V2+
Ov V2+
FH1
FH2
1715-TASOB8DE
Digital Output Simplex
Termination Assembly
32093 M
1715-TAD0B8DE
Digital Output Duplex
Termination Assembly
32121 M
Field Connections This Side
Field Connections This Side
Coding Pegs
Coding
Pegs
10 A Fuse
Fuse