Modbus MFU Option Card Installation Manual
6 of 64 Publication PUB091-004-00_0918
Partial Stroke Test Moving a little-used valve by a small percentage from an end limit and
then returning it, proving that it will operate when required. Safety
related.
RS-485 The electrical properties of the data highway as defined by the IEC
8482 standard, copper conductors, 2-wire twisted pair.
Segment A section of an RS-485 fieldbus that is terminated at each end in its
characteristic impedance. Each Segment can include up to 32 devices
with unitary load.
Abbreviations:
ACTCON Actuator Control (Register).
CMA Compact Modulating Actuator.
Comms Communications.
CRC Cyclic Redundancy Check (error detection).
CVA Control Valve Actuator.
CVL Linear version of CVA.
CVQ Quarter-turn version of CVA.
DIO 1 Digital Input / Output Board, type 1.
DIO 2 Digital Input / Output Board, type 2.
DV Desired Value.
ESD Emergency Shut Down.
IEC International Electrotechnical Commission.
MFU Modbus Field Unit.
MV Measured Value.
PCB Printed Circuit Board.
PLC Programmable Logic Controller.
RAM Random Access Memory.
RIRO 1 Remote Input / Remote Output Board, Type 1.
RIRO 2 Remote Input / Remote Output Board, Type 2.
ROM Read Only Memory.
RTU Remote Terminal Unit.
SW Software.
UPS Uninterruptible Power Supply (CVA only).
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