User Manual
Section 10
GFK-2958L
May 2021
Replacing Components
477
there is no need to disconnect and restart it. When replacing the electronic unit, the wiring
remains intact.
Operation and Behavior of I/O Module During Hot-swap
Behavior of Outputs
on Field Bus Error
Module behavior on hot swap:
Continue data exchange
Module behavior on hot swap: Behavior
like field bus error
All outputs off
The I/O modules continue
data exchange on hot swap of
the module.
All of the outputs will be OFF until the
module is replaced as per the original
configuration.
Enable substitute
value
The I/O modules continue
data exchange on hot swap of
the module.
All of the outputs will be replaced by the
substitute value as per the configuration
until the module is replaced as per the
original configuration.
Hold last value
The I/O modules continue
data exchange on hot swap of
the module.
All the outputs will be retained prior to hot
removal of the module until the module is
replaced as per the original configuration.
CAUTION
•
During hot insertion or removal of IO modules, a transient Loss of Power up-to 500ms
may occur on the network adapter and IO modules, during which all the outputs may
drop to zero. This system behavior should be verified against the application
requirements before hot insertion or removal of the IO module is done.
•
Data shift occurs when a module is pulled out from a node where similar modules are
sequentially configured. For example, when there are 6 RTD modules EP-3704
configured sequentially in the node, on hot-removing the module from the slot 4
would case the data from the module 5 and 6 to be reflected on variables configured
for slot 4 and 5 with ‘Loss of Module’ reported for slot 6
To replace the electronic unit
1.
Unlock the connector frame and open it as far as possible (at least to an angle of
90°).
