7.6 Unplugging/plugging during operation
The ability to detect a connected HT 8 in the PLC
1. HW solution:
Interface X7 of the Basic PN connection module signals "HT 8 Present" at pin 1 for the "active"
connection module (see interfaces (Page105)).
If the connection module is "inactive", this signal is not set.
This makes the "active" connection module detectable in the PLC by wiring the above-
mentioned pins of all connection modules to digital I/Os on PLC I/O modules.
2. Permanently congured MCPs / HT 8 connected to one control:
If there are only permanently congured MCPs / HT 8 that a control, removal of the MCP or
HT 8 triggers the PLC alarm "400260 Machine Control Panel failed".
Based on this, an "active" or "inactive" MCP / HT 8 in the PLC can be detected.
The failure of an MCP / HT 8 is, however, only detected in the PLC if max. 2 MCP / HT 8 are
permanently congured and no MCP switchover using FB9 (e.g. triggered when operator
focus is switched at the operator panel).
Note
Removing an HT8 where the integrated machine control panel is active
Depending at which interface in the PLC (FB1: MCP1 or MCP2) the HT8 is congured, before
removing the HT8, the transfer of the machine control panel signals must be stopped.
This is possible as direct axis via data block DB7 (instance of the FB1).
To do this, set the corresponding interface signal to "true":
• 1. Interface: DB7.DBX62.1 (MCP1Stop)
• 2. Interface: DB7.DBX62.2 (MCP2Stop)
If the machine control panel signals are not stopped, then the message "400260 machine
control panel x failed" is displayed at the user interface:
Transfer of the machine control panel signals can be restarted after inserting the HT 8. To do this,
set e.g. the PLC interface signal DB7.DBX62.1 (MCP1Stop) to "false".
Connecting
7.6Unplugging/plugging during operation
Handheld Terminal HT 8
114 Equipment Manual, 02/2024, A5E52918633B AA
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