Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 206)

206 Rockwell Automation Publication 1715-UM001C-EN-P - March 2014
Chapter 6 1715 Redundant I/O System in SIL 2 Safety Applications
Figure 62 - Duplex Star Topology with a ControlLogix Controller
Internal Diagnostics The 1715 adapters feature internal diagnostics to identify faults that develop
during operation and raise appropriate alarm and status indications. The
diagnostic systems run automatically and check for system faults associated with
the I/O modules and field faults associated with field I/O circuits.
The internal diagnostics detect and reveal both safe and dangerous failures. In a
duplex configuration, for example, diagnostics can address dangerous failures and
therefore the duplex system can be 1oo2 reverting to 1oo1 on the first detected
fault and reverting to fail-safe when both modules have a fault.
Power Supplies On de-energize-to-trip, two power supplies can be used if fault tolerance is
required on the power supplies.
If only one power supply is used, both of the power connections need to be
connected to it (system power can be from a different power supply to the I/O
modules).
1756-RM2 1756-EN2TR 1756-EN2TR 1756-RM2 1756-L72 1756-L72
1715-AENTR 1715-AENTR
IO BASE 1715-A310
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 TERMINAL IDENTITY
AOTA Dual.
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 TERMINAL IDENTITY
AOTA Dual.
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 TERMINAL IDENTITY
AOTA Dual.
1715-IB16D
IO BASE 1715-A310
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
TERMINAL IDENTITY
AOTA Dual.
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
TERMINAL IDENTITY
AOTA Dual.
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 TERMINAL IDENTITY
AOTA Dual.
1715-IB16D
1715-
OB8DE
1715-
OF8I
1715-
OF8I
1715-
OB8DE
1715-
TADOB8DE
1715-
TADIB16D
1715-A2A 1715-A3IO 1715-A3IO
IO BASE 1715-A310
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
TERMINAL IDENTITY
AOTA Dual.
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
TERMINAL IDENTITY
AOTA Dual.
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 TERMINAL IDENTITY
AOTA Dual.
1715-IF16
1715-A3IO
1715-
TADOF8
1715-
TADIF16
1715-IF16
EtherNet/IP
Switch
Sensor
Actuator