User manual

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• 6 - Programming Simatic 505 SoftShop
Mnemonic Instruction
DRUM Simulates electro-mechanical stepper
switch.
DSET Sets date in real-time clock.
EDRUM Simulates electro-mechanical stepper
switch. Can be indexed by timer,
event, or timer and event.
END Unconditionally terminates a scan.
EQU Equal to.
FRS Force role swap
GEQ Greater than or equal to.
GTR Greater than.
GTS Calls a subroutine.
IMC Compares status of discrete points
with a specified bit pattern in a set of
patterns.
IORW Does immediate read or write to
discrete or word I/O.
JMP Freezes outputs in zone of control.
JMPE Freezes outputs in zone of control.
LBL Selectively enable/disable program
segments during scan.
LDA Copies the logical address of a
memory location into a memory
location.
LDC Copies the logical address of a
memory location into a memory
location.
LEQ Less than or equal to.
LESS Less than
LOCK Used together with UNLOCK and
provide a mechanism whereby
multiple applications in the 575
system can coordinate access to
shared resources.
MCAT Motor control alarm timer.
MCR Master control relay.
MCRE Master control relay.
MDRMD Drum; uses configurable mask to
control coils.
MDRMW Drum; uses configurable mask to
write to words.
MIRF Copies a table into the control relay
memory or discrete image register.
MIRT Copies status of control relays or
discrete image register bits to table.
MIRW Copies bit status from control relays
or discrete image register to a word.
MOVE Copies bytes, words, or long words
from a source location to a