Parameters/address space
4.9 Safety functions
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
54 Equipment Manual, V1.0, 01/2021, A5E47073911-AA
4.9.2 Safety Limited Speed (SLS)
Safe speed monitoring
SLS monitoring is initiated whenever the "Enable Safe Speed" bit is set in the control interface
and subsequently processed by the F-TM Count module. SLS monitoring terminates
whenever the "Enable Safe Speed" bit is reset in the process output image and subsequently
processed by the module.
A "Safe Speed Event" is set whenever the calculated speed in either direction is greater than
the configured "Speed limit". Once set, the "Safe Speed Event" bit remains set and counting
continues after the event is triggered. The "Safe Speed Event" remains set until the "Reset
Safe Speed" control bit to 1, until a power cycle, or until a new parameterization is loaded.
Configuring a "Speed limit" value of 0 results in the "Safe Speed Event" being set immediately
after the first pulse in either direction.
Note
Triggering a "Safe Speed Event" is also dependent on the measured value, configured as
"Velocity", that updates your safety program once every update time.
Safe speed monitoring continues when counting is suspended and SLS monitoring is
enabled.
Since there is no active counting operation when counting is suspended, this safety function
becomes ineffective. This can result in unexpected machine or process operation, which can
cause death, severe personal injury, and/or property damage.
You must ensure steps outlined in safety standards applicable to your system are followed
before the event bit is reset.
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