Honeywell ControlEdge 900 platform, Hardware Planning And Installation Manual, Page: 161 / 230

161
Replacing an I/O module
CAUTION: Read and understand all of the following information
regarding Removal and Insertion Under Power (RIUP) before
attempting to remove and/or replace any I/O module,
particularly in a system that is actively controlling a process.
All of the I/O module types in the ControlEdge 900 controller include
the Removal and Insertion Under Power feature. That is, while the
rack is powered, any of the I/O Modules can be removed or inserted:
n
With no physical damage to the module, to the rack, or to other
modules in the rack
n
Without disturbing the functions of other I/O modules in the rack
or in the system.
Under carefully controlled circumstances, this feature enables the
user to remove and insert an I/O module without completely shutting
down a running system. However, it must be recognized that
removing or inserting an I/O module under power is potentially
hazardous to property and to personnel.
Circumstances that dictate prudent actions depend on conditions and
specific process applications at each user facility. It is the
responsibility of site personnel to know all potential consequences of
Removal and Insertion Under Power, and to take actions to prevent all
adverse consequences before removing or inserting an I/O module
under power. The following table provides some general guidelines
for establishing appropriate procedures at a given installation.
Hazard Source Preventive Action(s)
DANGER Potentially lethal voltages on
Terminal Blocks. Disconnect power and all signals at
terminal blocks from sources of
power before removing the terminal
block from the I/O module.
CAUTION Each signal at each of the
terminals for an I/O module has a
specific function. Any or all of the
signals may be vital for safely
controlling a process.
Using trained personnel and
appropriate control mechanisms,
transfer to manual control of each
signal that is necessary to maintain
safe process control.
CAUTION:
Removal or Insertion Under Power of an I/O module is an option,