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C 7.1)
PLC-command
format
Every PLC-command
requires
a 16 bit word
i.e. 2 bytes are defined
in the PLC-command
memory.
An command
consists
of a 4 bit PLC-operation
code and the 12 bit PLC-address.
The PLC-operation
code defines
the binary
instruction
and the PLC-address
calls a memory
location
for the operands
which
are to be processed.
Lower
EPROM
addresse.g.addressOjHigher
EPROM
address 3.g. address
1
4 Bit "
IFBit
PLC-operation
code
P LC-Add ress
C 7.2)
PLC-Operation
codes for PLC-Commands
Abbreviation
PLC-Operation
code
NOP
U
0000
0001
UN
0010
0
0011
ON
0100
x0
0101
XON
0110
S
0111
SN
1000
R
1001
RN
1010
=
1011
-
NOP
11111
C 7.3)
PLC-Address
for PLC-Commands
Abbreviation
PLC-Address
(Hexadecimal)
MO - M3279
000 - CCF
EO - El27
CD0 - D4F
AOm- A63
E50 - E8F
C 7.4)
EPROM
Address
list
The PLC program
is stored
in an HN2764
EPROM
Addresses:
PLC-Operand
1 msb - PLC-Address
EPROM-Address
0
P LC-Add ress
Isb
EPROM-Address
1
PLC-Operand
1 msb - PLC-Address
EPROM-Address
2
P LC-Add ress
Isb
EPROM-Address
3
PLC-Operand
1 msb - PLC-Address
EPROM-Address
4
P LC-Add ress
Isb
EPROM-Address
5
I
PLC-Operand
1 msb - PLC-Address
P LC-Add ress
Isb
Internal
P LC-software
!PROM-Address
4094
!PROM-Address
4095
EPROM-Address
8191
61
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