32 Rockwell Automation Publication 1791ES-UM001G-EN-P - November 2016
Chapter 2 About the Modules
The following is a list of features common to Guard I/O modules:
• CIP Safety and EtherNet/IP protocol conformance
• Safety 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.
– Single-channel evaluates one input signal (channel). This evaluation
allows use of the module Safe Inputs for safety Category 2 and in
applications rated up to and including Performance Level d /
SIL CL2.
– The time of a logical discrepancy between two channels can be
monitored by using a discrepancy time setting.
– An external wiring short circuit check is possible when inputs are
wired in combination with test outputs.
– Independently adjustable on and off delay is available per channel.
•Test outputs
– 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.
– All Guard I/O modules have numerous test outputs, of which some
can be used for broken wire detection of a muting lamp.
•Safety outputs
– Dual-channel mode evaluates consistency between two output
signals (channels).
– Safety outputs can be pulse tested to detect field wiring shorts to
24V DC and 0V DC.
• I/O status data – The module includes status data for monitoring I/O
circuits and I/O data.
• Removable I/O connectors (only 1791ES modules) – I/O connectors
support mechanical keying.
• Network address translation (NAT) support – Available in Logix
Designer version 24 or later, NAT is a service that translates one IP
address to another IP address via a NAT-configured switch. The switch
translates the source and destination addresses within data packets as
traffic passes between subnets. This service is useful if you must reuse IP
addresses throughout a network. For example, with NAT, you can
segment devices that share one IP address on a private subnet into
multiple identical private subnets while maintaining unique identities
on the public subnet.
See Table 6
for a description of the Guard I/O modules.
To Next Page
Loading...
