Values

Parameter	Value	Condition
Input connection reaction time limit	RPI x (TM + NDM)¹	Input connections. TM is the timeout multiplier; NDM is the network delay multiplier as a ratio, so 200% counts as 2.
Output connection reaction time limit	Task x (TM + NDM - 1)¹	Output connections. The output RPI is locked to the safety task period, so you change this limit by changing the safety task period.
Input RPI	10 ms¹	Default for safety input connections
Timeout multiplier	2¹	Default. Rockwell Automation says not to set it lower than 2 on any safety connection.
Network delay multiplier	200 %¹	Default; counts as 2 in the formula
Network delay multiplier range	10 to 600 %²	Valid range in the Advanced Connection Reaction Time Limit Configuration dialog; default 200
Input connection reaction time limit at defaults	40 ms¹	RPI 10 ms, timeout multiplier 2, network delay multiplier 200%
Output connection reaction time limit at defaults	3 x RPI³	Timeout multiplier 2 and network delay multiplier 200%. The input limit at the same defaults is 4 x RPI.
Safety RPI range, produced and consumed safety tags	1 to 500 ms⁴	Safety controllers. The RPI of a consumed safety tag must match the safety task period of the producing controller.
Safety I/O RPI range	2 to 500 ms³	1756 ControlLogix digital safety I/O modules; other safety I/O families set their own limits
Multipliers on wireless networks	May need to exceed defaults⁵	Rockwell Automation states that wireless networks can require timeout or network delay multipliers above the defaults, and that setting them below the defaults can cause nuisance safety connection losses.
Data age check	Time stamp per packet⁶	Each safety packet carries a time stamp. The consumer computes the data age and applies the data only if it is under the maximum allowed age; otherwise the connection goes to the safety state.
Safety integrity supported	Up to SIL 3⁷	Per IEC 61508. ODVA describes CIP Safety as a black channel protocol, so its integrity does not depend on the physical media.

Sources

Connection Reaction Time Limit (1756-RM015). Read Oct 5, 2026.
Advanced Connection Reaction Time Limit Configuration dialog box parameters. Read Oct 5, 2026.
1756 ControlLogix Digital Safety I/O Modules User Manual (1756-UM013B-EN-P). Read Oct 5, 2026.
Logix 5000 Controllers Produced and Consumed Tags (1756-PM011N-EN-P). Read Oct 5, 2026.
Consume Safety Tag Data (1756-UM900). Read Oct 5, 2026.
The Common Industrial Protocol (CIP) and the Family of CIP Networks (PUB00123R1). Read Oct 5, 2026.
CIP Safety (ODVA). Read Oct 5, 2026.

About this page

Built from 8 sources: 2 protocol owners and alliances and 6 vendor documents. Researched and drafted with AI assistance, then reviewed and approved by Ben Rutter on Oct 5, 2026. How pages are made

First published: Oct 5, 2026
Last updated: Oct 5, 2026

Change history (1)

Oct 5, 2026 First published

Cite this page

Plain

Ben Rutter. "CIP Safety connection timing." OT Wireless, published October 5, 2026. https://otwireless.com/requirements/cip-safety/

APA 7

Rutter, B. (2026, October 5). CIP Safety connection timing. OT Wireless. https://otwireless.com/requirements/cip-safety/

BibTeX

@misc{rutter2026cipsafety,
  author = {Rutter, Ben},
  title = {{CIP Safety connection timing}},
  year = {2026},
  howpublished = {\url{https://otwireless.com/requirements/cip-safety/}},
  organization = {OT Wireless},
}