Rockwell Automation 5094-IA16 - Safety Relay Output Module Features; Safety Application Suitability Levels; Safety Relay Output Module in CIP Safety Systems

84 Rockwell Automation Publication 5094-UM001E-EN-P - April 2020
Chapter 5 Safety I/O Module Features
Safety Relay Output
Module Features
This section describes features that are available only on the FLEX 5000 relay
4-point safety output modules.
The 5094-OW4IS and 5094-OW4ISXT relay modules are safety output
modules that use 4-point safety outputs.
Safety Application Suitability Levels
Tab le 17 describes the safety application suitability levels for a 5094-OW4IS or
5094-OW4ISXT module.
Safety Relay Output Module in CIP Safety Systems
The following apply to the safety relay outputs:
• You can connect safety devices, such as safety relays, safety contactors.
• Diagnostics. See Status and Fault Information in Module Properties
Categories.
• Safety relay output points are configured as the following:
–Not Used
–Safety
The safety relay module is rated up to 2A/channel when all 4 channels are used in
5…30V DC mode or 125/240V AC, 50/60 Hz mode. This module can also be
used in 5…30V DC applications requiring up to 4A/channel with the restriction
of using only channels 0 and 1; channels 2 and 3 are unused.
Snubber circuit is required when the relay output is used to drive inductive load.
See the module wiring diagram requirements on page 189
.
Table 17 - Safety Application Suitability for 5094-OW4IS and 5094-OW4ISXT Module
Suitability Level Conditions Notes
Applications that are rated up to, and including,
SIL CL2, PLd, Cat.3, as defined in IEC 61508, IEC
61551, IEC 62061, and ISO 13849-1
The modules uses single-channel mode
– Signal state change at least once a year
Consider the following:
• To achieve SIL CL3 single-channel, the actuator that is used
must be SIL CL3 single-channel as well.
• Use sheathed cable or cable trunk to separate channel
wiring to mitigate short-circuit fault.
• Fuse with proper rating should be connected to prevent
relay contacts from overload and short circuit.
• To achieve the specific Safety Integrity Level, see
Appendix C, Application/Wiring Examples for Safety I/O
Modules on page 181
.
Applications that are rated up to, and including,
SIL CL3, PLe, Cat.4, as defined in IEC 61508, IEC
61551, IEC 62061, and ISO 13849-1
1. The modules use single-channel mode:
– Signal state change at least once a month
2. The modules use dual-channel mode:
– Ladder logical alternative toggle each channel at
least once a month