Parameters/address space
4.9 Safety functions
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
Equipment Manual, V1.0, 01/2021, A5E47073911-AA
55
Using SLS monitoring
SLS monitoring is initiated by turning on the "Enable Safe Speed" bit.
Your safety program examines the "Safe Speed Event" bit in the feedback interface and takes
appropriate action during the SLS monitoring session.
Set the "Reset Safe Speed" bit to 1 to clear the "Safe Speed Event" bit in the feedback
interface.
If you want to start a new SLS monitoring session, clear and enable the "Enable Safe Speed"
bit must be cleared in the module and then once again set in the module by separate
executions of you safety program.
Note
Once set, the "Safe Speed Event" bit is also cleared by a power cycle, or when a new STEP 7
hardware configuration is downloaded. If you reset the "Safe Speed Event" and the safe
speed is still in violation, the "Safe Speed Event" bit will immediately set back to 1.
SLS suspension by external events
SLS monitoring suspension can result from the following external events:
• SW gate closure
• Counting limit violation if module is configured to stop counting when the limit is
violated. Refer to "Reactions to counting limit violation" for additional information.
Note
Counting operations that set the start value or exceed configured counting limits have no
effect in determining whether a safe spe
ed violation has occurred.
This means that regardless of how the "Reaction to violation of a counting limit" is configured
and the current count is subsequently manipulated, the "Safe Speed Event" is only initiated
upon actual violation of the specified "Speed limit".
4.9.2.1 Function of Safety Limited Speed (SLS)
The SLS function monitors the encoder and
notifies the user if the calculated speed ex-
ceeds the specified speed limit in either
direction.
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