List of abbreviations
E
E.1
List of abbreviations
List of abbreviations
Abbreviations
Explanations
AC
Alternating current
ADC
Analog-to-digital converter
AI
Analog input
AO
Analog output
AS
Automation system
STL
Statement list (type of representation in STEP 7)
BAF
Battery failure
BUS1F; BUS2F LED bus failure on the MPI/PROFIBUS DP interface 1 or 2
CH
Channel
COMP
Compensation circuit
CP
Communications processor
CPU
Central processing unit of the PLC
CR
Central rack
DAC
Digital-to-analog converter
DB
Data block
DC
Direct current
DI
Digital input
DO
Digital output
ESD
Electrostatic sensitive device
EMC
Electromagnetic compatibility
EEPROM
Electrically erasable programmable read-only memory
EPROM
Erasable programmable read-only memory
ER
Expansion rack
ID
Input delay
SV
Set substitution value
EXM
Extension module
EXTF
Error LED "external fault"
FB
Function block
FC
Function
FEPROM
Flash erasable programmable read-only memory
FM
Function module
FRCE
Fiber-optic cable
FC
Function block diagram
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
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