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Except for instructions for which conditions are not allowed (e.g., INTERLOCK
CLEAR and JUMP END, see below), every instruction line must also have at
least one condition on it to determine the execution condition for the instruction
at the right. Again, diagram A , below, must be drawn as diagram B. If an instruc-
tion must be continuously executed (e.g., if an output must always be kept ON
while the program is being executed), the Always ON Flag (SR 25313) in the SR
area can be used.
Instruction
25313
Instruction
Diagram A: Incorrect
Diagram B
Address
Instruction
Operands
00000
LD
25313
00001
Instruction
There are a few exceptions to this rule, including the INTERLOCK CLEAR,
JUMP END, and step instructions. Each of these instructions is used as the sec-
ond of a pair of instructions and is controlled by the execution condition of the
first of the pair. Conditions should not be placed on the instruction lines leading to
these instructions. Refer to Section 5 Instruction Set for details.
When drawing ladder diagrams, it is important to keep in mind the number of
instructions that will be required to input it. In diagram A, below, an OR LOAD
instruction will be required to combine the top and bottom instruction lines. This
can be avoided by redrawing as shown in diagram B so that no AND LOAD or OR
LOAD instructions are required. Refer to 5-8-2 AND LOAD and OR LOAD for
more details and Section 7 Program Monitoring and Execution for further exam-
ples.
00000
00001 00207
00207
00001
00000
00207
00207
Diagram A
Diagram B
Address
Instruction
Operands
00000
LD
00000
00001
LD
00001
00002
AND
00207
00003
OR LD
---
00004
OUT
00207
Address
Instruction
Operands
00000
LD
00001
00001
AND
00207
00002
OR
00000
00003
OUT
002
Programming Precautions
Section 4-10
Содержание SYSMAC C200HS
Страница 1: ...Cat No W235 E1 05 C200HS SYSMAC Programmable Controllers...
Страница 2: ...C200HS Programmable Controllers Operation Manual Revised February 2002...
Страница 3: ...iv...
Страница 5: ...vi...
Страница 379: ...371 SR word Corresponding key s Bit 279 03 04 05 3 06 07 VER 08 09 Monitoring Operation and Modifying Data Section 7 1...
Страница 470: ...468 Programmer Program Date Page Word Contents Notes Word Contents Notes Data Storage...
Страница 471: ...469 Programmer Program Date Page TC address T or C Set value Notes TC address T or C Set value Notes Timers and Counters...