Operating Instructions
Safety Relay with IO-Link ESM-CB
8
(Translation of the original operating instructions) 2522722-01-05/19
6. Function
6.1.
IO-Link communication and functions
The safety relay is an IO-Link device.
Communication via IO-Link offers cyclical (process data) and acyclical (device data and events) data exchange.
Important!
The cyclical and acyclical data can be found in chapter
14. IO-Link communication and diagnostic data
The following information is transmitted:
Ì
Device information of the safety relay (electronic rating plate, states of the device)
Ì
State information about connected BR safety switches
IO-Link communication can be used for the following functions as well:
Ì
Enable signal: non-safety-related signal for controlling the safety contacts of the safety relay
Ì
Chain reset: performing a reset of the BR safety switch chain
6.1.1. Enabling from the non-safety-related control system
The safety contacts of the safety relay can be controlled via a non-safety-related enable signal via IO-Link communication.
The start button does not have to be pressed again.
When the safety relay detects an IO-Link connection, the enable signal must be set accordingly via IO-Link communication
for operation.
This function is not relevant to safety and is subordinate to the safety engineering function of the safety relay. In other words,
the non-safety-related enable signal cannot start the safety contacts of the safety relay until the safety-relevant prerequisites
for sensor circuits and the starting circuit of the safety relay have been fulfilled.
The enable signal is controlled via cyclical data exchange (process data).
6.1.2. Chain reset
All BR safety switches in a chain can be centrally restarted with a chain reset via IO-Link communication.
This function facilitates the re-establishment of readiness after troubleshooting.
The chain reset command is controlled via cyclical data exchange (process data).