Channel Failure Acknowledge; Pulse Extension; Chatter Monitoring - Siemens Simatic S7-1500 Manual

Parameters/address space
4.2 Explanation of parameters
4.2.4.3

Channel failure acknowledge

Use in S7-1500 F-CPUs
This parameter is only relevant if the fail-safe module is operated on an S7-1500 F-CPU, and
can only be set if the F-parameter "Behavior after channel fault" is set to "Passivate channel"
and the F-parameter "Reintegration after channel fault" is set to "Adjustable".
The value of this parameter specifies how the channel should react to a channel fault:
● Manual: A channel failure is reintegrated after manual acknowledgment.
● Automatically: The channel is reintegrated automatically after a channel fault. Manual
acknowledgment is not necessary.
Use in S7-300/400 F-CPUs
The value of this parameter is not relevant in the case of operation on S7-300/400 F-CPUs.
There you set the corresponding property at the F-I/O DB by means of the ACK_NEC tag.
For detailed information about the F-I/O DB, refer to the SIMATIC Safety – Configuring and
Programming (http://support.automation.siemens.com/WW/view/en/54110126) manual.
4.2.4.4

Pulse extension

Function
Pulse extension is a function to extend a digital input signal. A pulse on a digital input is
extended to at least the assigned length. If the input pulse is already longer than the
assigned length, the pulse is not changed.
The fail-safe electronic module only lengthens pulses with the value "0" because the basis of
the safety concept is that there is a safe state for all process variables. For digital F-I/O, this
is the value "0", which applies to sensors as well as to actuators.
The pulse extension can only be configured with 1oo1 evaluation.
4.2.4.5

Chatter monitoring

Function
Chatter monitoring is a process control function for digital input signals. It detects and reports
unusual signal sequences in the process with 1oo1 evaluation, for example, an input signal
fluctuating between "0" and "1" too frequently. The occurrence of such signal characteristics
is an indication of faulty sensors or process control instability.
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Digital input module F-DI 16x24VDC (6ES7526-1BH00-0AB0)
Manual, 01/2016, A5E03858068-AA