Siemens SIMATIC S5-115U, Руководство пользователя

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S5-115U Manual STEP 5 Operations
8.4 Condition Code Generation
The processor of the S5-115U programmable controller has the following three condition codes:
•
CC 0
• CC 1
• OV (overflow)
The following operations affect the condition codes:
•
comparison operations
• arithmetic operations
• shift operations
• some conversion operations
The state of the condition codes represents a condition for the various jump operations.
Condition Code Generation for Comparison Operations
Execution of comparison operations sets condition codes CC 0 and CC 1 (see Table 8-32). The
overflow condition code is not affected. However, comparison operations affect the RLO. When a
comparison is satisfied, the RLO is 1. Consequently, the conditional jump operation "JC" can also
be used after a comparison operation.
Table 8-32. Condition Code Settings for Comparison Operations
Possible
Jump Operations
OV CC 0 CC 1
Condition Codes
Contents of ACCUM 2 as
Compared to Contents
of ACCUM 1
Equal to 0 0
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Less than
Greater than
JZ
JN, JM
JN, JP
0
1
1
0
EWA 4NEB 811 6130-02b
8-73