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The following diagram demonstrates the flow of processing and the switches
that are used for execution control. Here, either process A or process B is
used depending on the status of SW A1 and SW B1.
Process A
Process C
End
SW A1
SW B1
SW A2
SW B2
SW D
Process B
The program for this process, shown below, starts with two SNXT(09) that
start processes A and B. Because of the way 0001 (SWA1) and 0002 (SB
B1) are programmed, only one of these will be executed to start either proc-
ess A or process B. Both of the steps for these processes end with a
SNXT(09) that starts the step for process C.
0000
LD
0001
0001
AND NOT
0002
0002
SNXT(09)
1400
0003
LD NOT
0001
0004
AND
0002
0005
SNXT(09)
1401
0006
STEP(08)
1400
SNXT(09) 1401
0002 (SW B2)
STEP(08) 1400
SNXT(09) 1402
STEP(08) 1401
SNXT(09) 1402
STEP(08) 1402
SNXT(09) 1403
STEP(08)
Process A
Process B
Process C
0003 (SW A2)
0004 (SW B2)
0005 (SW D)
Process A
started.
Process A
reset.
Process
C started.
Process B
reset.
Process
C started.
Process C
reset.
0001 (SW A1)
SNXT(09) 1400
0002 (SW B2)
0001 (SW A1)
Address
Instruction
Operands
Address
Instruction
Operands
0100
LD
0003
0101
SNXT(09)
1402
0102
STEP(08)
1401
Address
Instruction
Operands
0200
LD
0004
0201
SNXT(09)
1402
0202
STEP(08)
1402
Address
Instruction
Operands
0300
LD
0005
0301
SNXT(09)
1403
0302
STEP(08)
Step Instructions
Section 5-18
Summary of Contents for SYSMAC C20K
Page 1: ...Cat No W146 E1 5 Programmable Controllers SYSMAC C20K C28K C40K C60K ...
Page 2: ...K type Programmable Controllers OPERATION MANUAL Revised July 1999 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 19: ...7 SECTION 2 Hardware Considerations 2 1 Introduction 2 2 Indicators 2 3 PC Configuration ...