remains in the "S1:Z_switching on inhibited" state (see Figure 5-4 Sequential control state graph
(Page 163)).
For safety reasons, the controller automatically switches to local mode under the following
conditions:
• Service button S402 (Open), S403 (Close) or S401 (Learn run) operated
• An external drive order is pending via the service interface (X8, terminal for service tool and
USB adapter)
• The local commissioning terminal module (H1, terminal module with S1 to S4, operator
control buttons for terminal module) is in a safety-related state by using the operator control
buttons
Note
Protected areas
Some areas of the navigation system are categorized as being safety-related. These include,
among others, all areas that aect the processing of the travel curve parameters. Local operation
mode ends and control is requested again by the PLC only upon leaving these protected areas.
5.5.5 Master monitoring
Master monitoring monitors the internal communication channel to the higher-level PLC. This
ensures a dened response to the following situations:
• Cable breakage (or bus interruption)
• Hardware fault in the sending/receiving unit
• Incorrect communication conguration (e.g. baud rate, polling list/slave addresses)
• Failure of the master system
Master monitoring is also referred to as a process timeout because it operates based on the user
data received at the application level. The parameter p2040 denes the monitoring time in ms.
If no user data is received within this period, the sequential control assumes the "S1:Z_switching
on inhibited" state (see Figure 5-4 Sequential control state graph (Page 163)). Monitoring can
be deactivated by setting the parameter p2040 to "0". The master cycle time and the type of
telegram communication must be considered when conguring the monitoring time. The
occurrence of a process timeout is visualized by the status code "y". A master timeout does not
need to be acknowledged because it is only to be evaluated as an alarm. A process timeout error
is subject to an o delay of 2 s.
Controllers
5.5 Relay and eldbus interfaces
ATD4xxW for industrial applications
162 System Manual, 06/2022, A5E51901827B AA
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