Distributed I/O system
233 System Manual, 09/2019, A5E03576849-AJ
12.1 Removing and inserting I/O modules/motor starters (hot swapping)
Introduction
The ET 200SP distributed I/O system supports removal and insertion of I/O modules and
motor starters (hot swapping) during operation (RUN mode):
● CPU/interface module HF, HS: You can remove and insert any number of I/O
modules/motor starters.
● ST, BA interface module: You can only remove and insert one I/O module/motor starter.
This section provides further information on removing and inserting I/O modules/motor
starters.
I/O modules/motor starters must not be removed or inserted during operation (RUN
operating state) in hazardous areas.
Requirements
The following table describes which modules you may insert and remove under which
conditions:
Table 12- 1 Removal and insertion of modules
• Digital output modules: Only when load is switched off
• Digital modules: For load voltage above the safe extra-low voltage: Only with
switched off load voltage supply
• Technology modules: Only with switched off supply voltage L+
• AI Energy Meter ST:
– Only when measuring voltage on primary side is switched off, or
– Without the special current transformer terminal, measuring voltage and load
current must be through the converters, which means the machine or the load
must be switched off in the process. With the special terminal, the process
can continue because the current transformer is isolated safely. However, the
measuring voltage on the module, at connections UL1-UL3, still needs to be
isolated.
Only in de-energized state.
Motor starter Yes
1)
Only when the load is disconnected; when switched on, the motor starter switches off
automatically when the rotary interlock is operated.
1) The motor starter also counts as removed in the parking position
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