Abbreviations
Explanations
GD
Global data communication
ES
Sensor supply
IC
Constant-current line
IFM1F; IFM2F
LED error at interface module 1/2
IM
Interface module
INTF
Error LED "internal fault"
IP
Intelligent I/O
L+
Terminal for 24 VDC supply voltage
HLV
KLV
FOC
Fiber-optic cable
LAD
Ladder logic diagram
M
Chassis ground
M+
Measuring line (positive)
M-
Measuring line (negative)
M
ANA
Reference potential of the analog measuring circuit
MPI
Multipoint interface
MRES
Master reset position of the toggle switch for general reset of the CPU
MSTR
Master
OB
Organization block
OP
Operator panel
OS
Operator system
PIO
Process image of outputs
PII
Process image of inputs
PG
Programming device
PS
Power supply
Q
I
:
Analog output current
Q
V
:
Analog output voltage
RAM
Random access memory
REDF
Redundancy fault
R
L
:
Load impedance
S +
Sensing line (positive)
S-
Sensing line (negative)
SCL
Structured control language
SFB
System function block
SFC
System function
SM
Signal module
PLC
Programmable logic controller
SSL
Signal module
TD
HMI (text display)
SSL
Transducer
UC
Universal current
TD
Universal rack
U
CM
Common mode voltage
List of abbreviations
E.1 List of abbreviations
S7-400 Automation System Module Data
438
Reference Manual, Ausgabe 11/2016, A5E00850736-08