77
Also, if an instruction requires only a single bit operand (with no definer), the bit
operand is also placed on the same line as the instruction. The rest of the words
required by an instruction contain the operands that specify what data is to be
used. All other instructions are written with the instruction on the first line fol-
lowed by the operands one to a line. An example of mnemonic code is shown
below. The instructions used in it are described later in the manual. When input-
ting programs in mnemonic form from the CVSS, most operands are separated
only by spaces. Refer to the
CVSS Operation Manuals
for details.
Address Instruction Operands
00000 LD 000000
00001 AND 000001
00002 OR 000002
00003 LD NOT 000100
00004 AND 000101
00005 AND LD 000102
00006 MOV(030)
0000
D00000
00007 CMP(020)
D00000
0000
00008 LD 025505
00009 OUT 000501
00010 MOV(030)
D00000
D00500
00011 DIFU(013) 000502
00012 AND 000005
00013 OUT 000503
The address and instruction columns of the mnemonic code table are filled in for
the instruction word only. For all other lines, the left two columns are left blank. If
the instruction requires no definer or bit operand, the operand column is left
blank for first line. It is a good idea to cross through any blank data column
spaces (for all instruction words that do not require data) so that the data column
can be quickly scanned to see if any addresses have been left out.
When programming, addresses are automatically displayed and do not have to
be input unless for some reason a different location is desired for the instruction.
When converting to mnemonic code, it is best to start at Program Memory ad-
dress 00000 unless there is a specific reason for starting elsewhere.
4-3-3 Ladder Instructions
The ladder instructions are those instructions that correspond to the conditions
on the ladder diagram. Ladder instructions, either independently or in combina-
tion with the logic block instructions described later, form the execution condi-
tions upon which the execution of all other instructions are based.
Basic Ladder Diagrams Section 4-3
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