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The program for this process, shown below, starts with two SNXT(09) instruc-
tions that start processes A and B. Because of the way 00001 (SW A1) and
00002 (SB B1) are programmed, only one of these will be executed to start either
process A or process B. Both of the steps for these processes end with a
SNXT(09) that starts the step for process C.
SNXT(09) HR 0001
00002 (SW B2)
STEP(08) HR 0000
SNXT(09) HR 0002
STEP(08) HR 0001
SNXT(09) HR 0002
STEP(08) HR 0002
SNXT(09) HR 0003
STEP(08)
Process A
Process B
Process C
00003 (SW A2)
00004 (SW B2)
00005 (SW D)
Process A started.
Process A reset.
Process C started.
Process B reset.
Process C started.
Process C reset.
00001 (SW A1)
SNXT(09) HR 0000
00002 (SW B2)
00001 (SW A1)
Address Instruction Operands Address Instruction Operands
00000 LD 00001
00001 AND NOT 00002
00002 SNXT(09) HR 0000
00003 LD NOT 00001
00004 AND 00002
00005 SNXT(09) HR 0001
00006 STEP(08) HR 0000
Process A
00100 LD 00003
00101 SNXT(09) HR 0002
00102 STEP(08) HR 0001
Process B
00100 LD 00004
00101 SNXT(09) HR 0002
00102 STEP(08) HR 0002
Process C
00200 LD 00005
00201 SNXT(09) HR 0003
00202 STEP(08) ---
Step Instructions Section 5-24