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GFK-0825F Chapter 2 Description 2-7
2
Hot Insertion/Removal of Modules
Bus Interface Units IC670GBI002(F) and IC670GBI102A or later support Hot Insertion/Removal
of modules in the I/O Station.
Hot Insertion/Removal means that modules can be removed and replaced while I/O Station power
is applied without affecting the BIU or other modules in the I/O Station. Separate I/O module
power must be switched off to the module being inserted or removed.
Hot Insertion/Removal requires the use of specific modules and I/O terminal blocks:
•
I/O modules having catalog number suffix J or above. These modules have a projecting
alignment tab that fits into a corresponding alignment tab on I/O Terminal Blocks listed below.
Note that modules with this tab can also be installed on older I/O Terminal Blocks that do not
have mating alignment tabs. However, Hot Insertion/Removal are not supported in such an
installation.
•
I/O Terminal Blocks IC670CHS101, 102, or 103. These I/O Terminal Blocks have projecting
alignment tabs designed to facilitate Hot Insertion/Removal of modules. Modules that are
earlier than revision J cannot be mounted on these terminal blocks.
I/O Terminal Blocks IC670CHS001, 002, and 003, which lack alignment tabs, do not support
Hot Insertion/Removal of modules. With these terminal blocks, I/O Station power should be
off when installing or removing modules.
Mixing IC670CHS10x terminal blocks with IC670CHS00x terminal blocks in the same I/O
station is not recommended.
Faults Reported During Hot Insertion/Removal
When using the recommended equipment listed above, Hot Insertion/Removal will cause the
expected fault reports related to the loss of or addition of the module and its I/O circuits. These
faults should be cleared in the normal manner. However, Hot Insertion/Removal of a rev. J or later
module will NOT cause Configuration Mismatch errors that in some types of systems can shut
down the controller.
I/O Module Data During Hot Insertion/Removal
As mentioned, separate I/O module power must be turned off for Hot Insertion/Removal. When the
module is installed and power is reapplied, module data will quickly return to normal. For
intelligent I/O modules, there may be a delay of a few seconds while the module goes through its
powerup sequence.
Hot Insertion/Removal for a Micro Field Processor
A Micro Field Processor that is revision J or later may be removed/inserted as described above.
Note, however, that although the Micro Field Processor will start functioning upon reinstallation,
the MFP's application program must be reloaded. I/O data controlled by the Micro Field Processor
will be incorrect until that has been done. (The BIU configuration of the Micro Field Processor is
not affected by Hot Insertion/Removal).
Hot Insertion/Removal Not Permitted in Hazardous Locations
In hazardous locations, I/O Station power must be turned off before inserting/removing module.
Failure to observe this precaution may result in personal injury, system malfunction and/or damage
to the equipment.