Rockwell Automation 1791DS-IBxxxx Guard I/O DeviceNet Safety Modules - Manual (Page 18)

18 Rockwell Automation Publication 1791DS-UM001J-EN-P - May 2013
Chapter 1 About the Modules
The following is a list of features common to Guard I/O modules:
• CIP-safety and DeviceNet 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.
– The time of a logical discrepancy between two channels can be
monitored using a discrepancy time setting.
– 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 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
– Solid state 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.
• All 1791DS-IB8XOBV4 modules’ safety outputs use pulse testing to
detect a short to 24V DC on the safety source output (P), and a short to
0V DC on the safety sink output (M).
– Relay Outputs
• Dual-channel mode evaluates consistency between two output signals
(channels).
• Up to 2 A is provided per output point.
• Safety relays can be replaced.
• I/O status data - In addition to I/O data, the module includes status data
for monitoring I/O circuits.
• Security - The configuration information of the module can be protected
by a password.
• Removable I/O connectors - I/O connectors support mechanical keying.