BECKHOFF AX2000 PROFIBUS DP communication profile - Manual (Page 6)

1.3 Symbols used in this manual
danger to personnel from
electricity and its effects
general warning
general instructions
mechanical hazard
ð
p. see ... (cross-ref.) l special emphasis
1.4 Abbreviations used in this manual
The abbreviations used in this manual are explained in the table below.
Abbrev. Meaning
AGND Analog ground
BTB/RTO Ready to operate
CLK Clock signal
COM Serial interface for a PC-AT
DGND Digital ground
DIN German Institute for industrial Standards
Disk Magnetic storage (diskette, hard disk)
EEPROM Electrically erasable programmable memory
EN European standard
IEC International Electrotechnical Commission
INC Incremental Interface
LED Light-emitting diode
MB Megabyte
NI Zero pulse
NSTOP Limit-switch input for CCW rotation (left)
PZD Process data
PSTOP Limit-switch input for CW rotation (right)
RAM Volatile memory
RES Resolver
ROD A quad B encoder
PLC Programmable logic controller
SSI Synchronous serial interface
VAC AC voltage
VDC DC voltage
6 PROFIBUS for AX2000/2500
General
12/05
BECKHOFF