Emerson ROC827 - Manual (Page 73)

ROC827 Instruction Manual
Issued Mar-06 Input/Output Modules 4-3
ƒ Analog Output (AO), Discrete Output (DO), and Discrete Output
Relay (DOR) modules that provide the ability to manage various
control devices.
ƒ The RTD Input and Thermocouple Input (T/C) modules that provide
the ability to monitor various analog temperature field values.
ƒ The Highway Addressable Remote Transducer (HART) interface
modules that enable the ROC827 to communicate with HART devices
using the HART protocol as either Analog Inputs or Analog Outputs.
Each module rests in a module slot at the front of the ROC827 base unit or
EXP housing. You can easily install or remove I/O modules from the
module slots while the ROC827 is powered up (hot-swappable). Modules
may be installed directly into unused module slots (hot-pluggable), and
modules are self-identifying in the software. All modules have removable
terminal blocks to make servicing easy. I/O modules can be added in any
module slot.
The I/O modules acquire power from the backplane. Each module has an
isolated DC/DC converter that provides logic, control, and field power as
required. The ROC827 has eliminated the need for fuses on the I/O
modules through the extensive use of current-limited short-circuit
protection and over voltage circuitry. Isolation is provided from other
modules and the backplane, power, and signal isolation. The I/O modules
are self-resetting after a fault clears.
4.2 Installation
Each I/O module installs in the ROC827 in the same manner. You can
install any I/O module into any module socket, whether empty or in place
of another module.
Caution
Failure to exercise proper electrostatic discharge precautions, such as
wearing a grounded wrist strap may reset the processor or damage
electronic components, resulting in interrupted operations.
When installing units in a hazardous area, make sure all installation
components selected are labeled for use in such areas. Installation and
maintenance must be performed only when the area is known to be non-
hazardous. Installation in a hazardous area could result in personal injury
or property damage.
You can insert or remove the I/O modules while power is connected to the
ROC827. If the ROC827 is powered, exercise caution while performing
the following steps to install a module.
Note
: After you install a new I/O module or replace an existing I/O
module, it may be necessary to reconfigure the ROC827. To change
configuration parameters, use ROCLINK 800 software to make changes to
the new module. Any added modules (new I/O points) start up with