GE RSTi-EP - Page 388

Chapter 10 Replacing Components
GFK-2958E RSTi-EP User Manual 384
An electronic unit can be replaced while the system is powered up (no load) and in operation without
having to disassemble the module. The station remains functional, and 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
500 ms may occur on the network adapter and IO modules, during which all of
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.
Caution
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.