Siemens SIMATIC S7-300 Manual page 324

List of Abbreviations
FC Function
FEPROM
Flash EPROM: Read/Write memory
FM Function module
HEX Hexadecimal
HMI
Device for operating and monitoring of a process
I
Input parameter
IM Interface module (SIMATIC S7)
I/Q In/out parameter (initialization parameter)
LAD Ladder program
LED Light Emitting Diode
MLFB Machine-readable order designation
MPI Multi Point Interface
MSR Measurement system raster
MDI Manual Data Input
OB
Organization block
OP
Operator panel
PG
Programming device
PLC Porgrammable controller
PS Power Supply (SIMATIC S7)
PWM Pulse width modulation
Q
Output parameter
RFG
Controller enable
RPS
Reference point switch
SDB System data block
SFC System Function Call (integrated fucntions)
STEP 7 Programming device software for SIMATIC S7
S7-300 PLC of medium performance range
SM
Signal module (SIMATIC S7, e.g. input/output module)
SSI
Synchronous Serial Interface
STL
Statement list
SZL System status list
TF Technology function
UP User program
C-2
FM 354 Servo Drive Positioning Module