206
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
Chapter 7 1715 Redundant I/O System in SIL 2 Safety Applications
Figure 66 - 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 that are
associated with the I/O modules and field faults that are 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 must be
connected to it (system power can be from another power supply to the I/O
modules).
For energize-to-action, dual power supplies are required for both the system
and field supplies. The system provides the power supply monitoring, but this
needs to be connected in the application.
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