Internal Diagnostics; Power Supplies - Rockwell Automation Allen-Bradley 1715-AENTR User Manual

Chapter 7 1715 Redundant I/O System in SIL 2 Safety Applications
Sensor

Internal Diagnostics

Power Supplies

206
Figure 66 - Duplex Star Topology with a ControlLogix Controller
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.
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.
Rockwell Automation Publication 1715-UM001J-EN-P - December 2020
EtherNet/IP
Switch
1715- 1715- 1715-
TADIB16D TADOB8DE TADOF8 TADIF16
TERMINAL IDENTITY
TERMINAL IDENTITY TERMINAL IDENTITY TERMINAL IDENTITY TERMINAL IDENTITY TERMINAL IDENTITY TERMINAL IDENTITY
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
AOTA AOTA AOTA
Dual. AOTA AOTA AOTA AOTA
Dual. Dual. Dual. Dual. Dual. Dual.
1715-A2A 1715-A3IO 1715-A3IO
Actuator
1715-
TERMINAL IDENTITY TERMINAL IDENTITY
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
CH1 CH1
CH1 CH1 CH1 CH1 CH1 CH1 CH1 CH1
AOTA AOTA
Dual. Dual.
1715-A3IO