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ROC800-Series Instruction Manual
Revised Jul-14
Input/Output Modules
4-3
I/O modules for the ROC800 include:
Analog Input (AI) modules that provide the ability to monitor
various analog field values.
Discrete Input (DI) and Pulse Input (PI) modules that provide the
ability to monitor various discrete and pulse input field values.
Analog Output (AO), Discrete Output (DO), and Discrete Output
Relay (DOR) modules that provide the ability to manage various
control devices.
Advance Pulse modules (APM) that provide advanced functionality
(such as densitometer support) commonly found in liquids and gas
measurement applications.
Alternating Current I/O (ACIO) modules that control various AC
output field devices and monitor various AC input field values.
Multiple Variable Sensor I/O (MVS I/O) modules that provide
differential pressure, static pressure, and temperature inputs for
orifice flow calculation.
Resistance Temperature Detector (RTD) and Thermocouple (TC)
modules that provide the ability to monitor various analog
temperature field values.
HART module that receives and sends I/O from HART devices via a
4-20 mA analog signal.
Each module rests in a module slot at the front of the ROC800 or EXP
housing. All modules have removable terminal blocks to make servicing
easy. You can insert I/O modules in any module slot; modules are self-
identifying in the software.
Caution
The design of ROC800-Series communications and I/O modules
supports “hot-swapping” (replacing similar modules in the same slot)
and “hot-plugging” (inserting modules into an empty slot) while the
ROC800 is powered. However, it is a good safety practice with any
electrical device to first remove power before you make internal
connections. If you find it necessary to hot-swap or hot-plug a module,
first review the most current specification sheet for that module to
ensure both your safety and the integrity of data that module may
provide.
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 ROC800 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.