Disable Switchover Between Tcu Via Plc - Siemens SINUMERIK 840D sl Manual

Networking
5.2 Commissioning TCU
Supplementary conditions
The following supplementary conditions apply when operating the TCU:
2 active TCU connected in parallel to NCU 710.3 PN
4 active TCU connected in parallel to NCU 720.3 PN, NCU 730.3 PN
4 active TCUs connected in parallel to PCU/IPC
Displacement rules
You configure the displacement mechanism in SINUMERIK Operate in the "Setup" operating
area > menu forward key > "OPs" softkey for the respective operator panel.
The TCU can assume the following states:
● The TCU is active and has user authorization: This can be identified as the TCU shows the
screen of the operating software and the screen is bright.
● The TCU is active, is in the monitoring mode and has no user authorization: This can be
identified as the TCU shows the screen of the operating software, however, it is darkened
in comparison to the TCU with user authorization.
● The TCU is passive: The TCU shows the selection menu of the possible connections
instead of a screen of the operating software, and the softkey for selection of the last active
connection of the TCU is shown in color.
When powering up, the TCU always always attempts to establish the first connection. The
TCUs from a shadowing group establish their specified connection one after the other as long
as the maximum number of permissible active operator units is not exceeded.
If a TCU encounters the situation that this number is already reached in its power up, then it
attempts to obtain a connection via the displacement mechanism. If it can displace a formerly
active operator unit then it takes on the active status itself, otherwise it transitions to passive
status immediately after booting.
5.2.4

Disable switchover between TCU via PLC

Overview
The TCU switchover disable offers the option of dynamically disabling switchover from one
TCU to the next when the system is running via the PLC. For the duration of the disable, a user
authorization request to change user authorizations between TCUs will be ignored by the
system and rejected.
The rejected user authorization request causes a message to be output in the dialog line of the
HMI, in the form of a feedback message for the requester. The message disappears after five
seconds.
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Operator panel front: OP 012
Manual, 05/2019, A5E36371591B AB