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C)
Programming
of the HEIDENHAIN
PLC
C 1)
Description
of the PLC Commands
It is convenient
to represent
the integrated
PLC in the HEIDENHAIN
control
TNC 150 as relays or various
logic
circuits.
These comprise
commands
that the binary
operations
(logic gates) execute.
A PLC programme
can consist
of up to 2048 commands.
Each individual
logic command
combines
two input
values, of which
the first
is the result of the previous
logic gate and the second
is self-addressed
with
the logic
command.
Gates with
inputs are possible
using a series string
of multiple
commands.
The following
commands
are programmable:
Command
Abbreviation
No Operation
NOI'
Assignment
=
,
AND
AND
with
negative operand
(NAND)
OR
OR with
negative operand
(NOR)
EXCLUSIVE
OR
U
UN
0
ON
x0
EXCLUSIVE
OR with
negative operand
(EXCLUSIVE
NOR)
Set memory
or output
if result of previous
logic gate
is logic "1"
Set memory
or output
if result of previous
logic gate
is logic "0"
,
Reset memory
or output
if result of previous
logic
gate is "1"
Reset memory
or output
if result of previous
logic
gate is "0"
XOIV
S
SN
R
RN
C
1.1)
No Operation:
NOP
No Operation
design,ates an empty
memory
location
in the command
memory.
Every memory
locatiion in the command
memory
which
is not occupied
by another
command,
functions
as a
NOP-command.
Command
Abbreviation
No operation
NOP
C 1.2)
Assignment:
=
The preceding
logic circuit
is assigned
to a marker
or output:
a logic sequence
is interrupted.
Command
Abbreviation
PLC-Programme
Assignment
=
U El
U E2
= M30
15
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