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S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
List of Abbreviations
Abbreviation
Explanation
AC
Alternating current
ADC
Analog to digital converter
AI
Aanalog input
AO
Analog output
AS
Automation system
BAF
Battery failure
BUSF1;
BUSF2
LED – bus failure on the MPI/Profibus DP interface 1 or 2
CD
Central device
CH
Channel
COMP
Compensating terminal
CP
Communications processor
CR
Central rack
CPU
Central processing unit of a PLC
DAC
Digital-to-analog converter
DB
Data block
DC
Direct current
DI
Digital input
DO
Digital output
EMC
Electromagnetic compatibility
EEPROM
Electrically erasable programmable read-only memory
EPROM
Erasable programmable read-only memory
ER
Expansion rack
ES
Encoder supply
ESD
Electrostatic sensitive devices
EWS
Apply substitute value
EXM
Extension module
EXTF
Error LED “external fault”
FB
Function block
FBD
Function block diagram
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