20 Rockwell Automation Publication 1734-UM013N-EN-P - September 2017
Chapter 1 POINT Guard I/O Overview
• 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 that are rated up to and including Performance
Level e/SIL CL3 when both channels' Point Mode configurations are set
to Safety Pulse Test.
• Single-channel mode provides control by using one output signal
(channel), which allows use of the module for safety Category 2, and
applications that are rated up to and including Performance Level d/SIL
CL2 when the channel's Point Mode configuration is set to Safety Pulse
Te s t .
• Safety outputs can be pulse-tested to detect field wiring short circuits to
24V DC.
1734-OBV2S POINT Guard I/O Module Features
• 4 Bipolar outputs (2 pairs)
• 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 that are rated up to and including Performance
Level e/SIL CL3 when both channels' Point Mode configurations are set
to Safety Pulse Test.
• Safety outputs can be pulse-tested to detect field wiring short circuits to
24V DC (for the sourcing output of the bipolar pair) and ground (for the
sinking output of the bipolar pair).
1734-IE4S Safety Analog Input Module Features
• Connection of up to four voltage or current sensors.
• Sensor power outputs are individually current-limited and monitored.
1734-OB8S Single-channel mode is only certified for functional safety
applications with process safety times greater than or equal to 600 ms; or,
applications with demand rates less than or equal to 1 demand per minute.
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