Maintenance
8
8.1 Pulling and plugging modules in runtime (overview)
NOTICE
I/O modules in the I/O redundancy mode for which at least one channel is configured with
"Keep last value"
When the CPU is in "STOP" mode or the PROFINET cable is pulled, the following action are
also prohibited one after the other:
● Replacement of both I/O modules
● Firmware update for both I/O modules
Without an active connection to the CPU in "RUN" mode, the online parameter "Keep last
value" is reset in both I/O modules. Both I/O modules output the value 0.
Requirements
The following table describes which modules you may insert and remove under which
conditions:
Table 8-1 Inserting and removing in process mode
Modules Inserting and remov‐
ing
Conditions
BusAdapter Yes Only in redundant mode.
Interface module Yes Only in redundant mode.
Carrier module Yes During operation, only expandable or remove last mod‐
ule without an I/O module.
Terminal block Yes During operation, only expandable or removable without
an I/O module
NOTE: This interrupts the power bus.
I/O modules Yes NOTICE
Removing or inserting digital output modules with ap‐
plied load and with applied supply voltage can result in
dangerous conditions in your plant.
You can find information on disconnecting the load in the
section "Removing I/O modules (Page 114)".
IO redundancy:
You can remove an I/O module during operation when
the other I/O module is fully functional.
Server module Yes ---
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD 117
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