Product overview
2.2 Functions
ET 200SP F-TM Count 1x1Vpp sin/cos HF (6ES7136-6CB00-0CA0)
Equipment Manual, V1.0, 01/2021, A5E47073911-AA
21
Maximum signal frequency
The F-TM Count module evaluates the input frequency. When encoder signal frequency
reaches the maximum frequency rating (200 kHz), a reintegratable frequency error is
generated.
The count value can potentially be affected when exceeding the maximum supported
signal frequency.
Your safety program must determine whether the reported count value remains
representative of actual position. If position is lost, your safety program must do a homing
operation and then reset the counter to its respective start value.
In situations where encoder signal frequency exceeds 250 kHz, the module generates a
module is defective buffer diagnostic message. However, the module is not defective since
the fatal error was caused by external events. The module must be power cycled to recover
from the error.
N signal plausibility monitoring
This feature is only available when the encoder signal type is selected as an "A, B, N" signal
and the "Pulses per revolution" is set to a non-zero value during module configuration in STEP
7. The test uses the "Pulses per revolution" parameter to determine the expected number of
counts per revolution of the encoder. In situations where the N signal is not received at the
configured "Pulses per revolution", a channel diagnostic event is generated.
The module continues monitoring the encoder and accumulating counts while the diagnostic
is present. While the diagnostic is present, a count value of zero and status values of zero
(safe state values) are provided to your safety program. When the error is resolved and the
channel is reintegrated the module will return the accumulated count and status values to
your safety program.
It is possible for a channel fault to occur that is not readily detected by the module
diagnostics if N signal plausibility monitoring is disabled.
Loss of the safety function can result in unexpected machine or process operation, which
can cause death, severe personal injury, and/or property damage.
If N signal plausibility monitoring is disabled, N signal or wire break errors detected are not
reported and you might not achieve your required level of safety. You must provide your
own safety measures if you disable these features.
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