ABB 615 Series ANSI Manual page 58

Section 5
Glossary
52
MCD Momentary change detect
Modbus A serial communication protocol developed by the Modicon
company in 1979. Originally used for communication in PLCs and
RTU devices.
Modbus ASCII Modbus link mode. Character length 10 bits.
Modbus Allocation of accessible protocol data
memory map
Modbus RTU Modbus link mode. Character length 11 bits.
Modbus TCP/IPModbus RTU protocol which uses TCP/IP and Ethernet to carry
data between devices
MOM Momentary position
PCM600 Protection and Control IED Manager
PLC Programmable logic controller
PST Parameter Setting Tool in PCM600
RS-485 Serial link according to EIA standard RS485
RTC Real-time clock
RTU Remote terminal unit
SCADA Supervision, control and data acquisition
SEC Security violation
SPC Single point status of a controllable object
SPS Single point status
SSR1 System status register for device health
SSR2 System status register for device mode
SSR3 System status register for data available 1
SSR4 System status register for data available 2
SSR5 System status register for device alive counter
SSR6 System status register for last command result
SW Software
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
UDR User-definable register
UID Unique ID
UTC Coordinated universal time
1MAC052634-MB D
615/620 series ANSI
Communication Protocol Manual