Recommended Safety I/O Settings
We recommend the following settings for safety I/O:
- Timeout multiplier—Use a minimum safety timeout multiplier of 2 on both input and output connections. This recommendation helps to make sure that timeouts do not occur during a loss of redundancy.
- Network delay multiplier—The network delay multiplier represents the transport time of a message across the communication network. You can tune this value to your application, but we recommend that you test to make sure that the I/O connections survive a loss of redundancy. Use a minimum value of 200, which means 200%.
IMPORTANT:
To determine the appropriate values, analyze each safety channel. The default Timeout Multiplier of 2 and Network Delay Multiplier of 200 creates a worse-case input connection reaction time limit of 4 times the RPI, and an output connection reaction time limit of 3 times the RPI. Changes to these parameters must be approved only after a thorough review by a safety administrator.
Safety I/O Settings
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