18 Rockwell Automation Publication 1734-UM013J-EN-P - July 2014
Chapter 1 POINT Guard I/O Overview
Distributed I/O communication for safety I/O data is performed through safety
connections supporting CIP Safety over an EtherNet/IP or DeviceNet network.
Data processing is performed in the safety controller. The status and fault
diagnostics of POINT Guard I/O modules are monitored by a controller.
In addition to I/O state data, the modules include status data for monitoring I/O
faults within each circuit.
The configuration information of the modules can be protected by a password.
1734-IB8S Digital Input Module Features
• Safety digital inputs
– Safety devices, such as emergency stop push buttons, gate switches, and
safety light curtains, can be connected.
– Dual-channel mode evaluates consistency between two input signals
(channels), which allows use of the module for safety Category 3 and 4
and in applications rated up to and including Performance Level e/
SIL CL3.
– Single-channel mode evaluates one input signal (channel), which allows
use of the module for safety Category 2 and in applications rated up to
and including Performance Level d/SIL CL 2.
– You can configure a discrepancy time to control how long two channels
are allowed to be discrepant before a fault is declared.
– An external wiring short-circuit check is possible when inputs are wired
in combination with test outputs. The module must be wired in
combination with test outputs when this function is used.
– Independently adjustable on and off delays are available per channel.
• Test outputs (digital input modules only)
– Separate test outputs are provided for short-circuit detection of a safety
input (or inputs).
– Power (24V) can be supplied to devices, such as safety sensors.
– Test outputs can be configured as standard outputs.
– Specific test outputs can be used for broken-wire detection of a muting
lamp.
1734-OB8S Safety Digital Output Module Features
• Solid-state outputs
• Dual-channel mode provides redundant control by using two output
signals (channels), which allows use of the module for safety Category 3
and 4, and applications rated up to and including Performance Level e/
SIL CL3.
• Safety outputs can be pulse-tested to detect field wiring short circuits to
24V DC.
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