Siemens Simatic S7-400 - Manual (Page 603)

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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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