203
Work Bits (Internal Relays) Section 4-5
mine output conditions for IR 10000, IR 10001, and IR 10002, i.e., to turn the
outputs allocated to these bits ON or OFF.
Differentiated Conditions Work bits can also be used if differential treatment is necessary for some, but
not all, of the conditions required for execution of an instruction. In this exam-
ple, IR 10000 must be left ON continuously as long as IR 001001 is ON and
both IR 00002 and IR 00003 are OFF, or as long as IR 00004 is ON and IR
00005 is OFF. It must be turned ON for only one cycle each time IR 00000
turns ON (unless one of the preceding conditions is keeping it ON continu-
ously).
This action is easily programmed by using IR 22500 as a work bit as the oper-
and of the DIFFERENTIATE UP instruction (DIFU(13)). When IR 00000 turns
ON, IR 22500 will be turned ON for one cycle and then be turned OFF the
next cycle by DIFU(13). Assuming the other conditions controlling IR 10000
are not keeping it ON, the work bit IR 22500 will turn IR 10000 ON for one
cycle only.
00000
00003
00001
00004
00002
00005
00004
00007
00006
0000521600
21600
21600
21600
10000
10001
10002
Address Instruction Operands
00000 LD 00000
00001 AND NOT 00001
00002 OR 00002
00003 OR NOT 00003
00004 OUT 21600
00005 LD 21600
00006 AND 00004
00007 AND NOT 00005
00008 OUT 10000
00009 LD 21600
00010 OR NOT 00004
00011 AND 00005
00012 OUT 10001
00013 LD NOT 21600
00014 OR 00006
00015 OR 00007
00016 OUT 10002
•
22500
DIFU(13) 22500
00000
00001 00002 00003
00004 00005
10000
Address Instruction Operands
00000 LD 00000
00001 DIFU(13) 22500
00002 LD 22500
00003 LD 00001
00004 AND NOT 00002
00005 AND NOT 00003
00006 OR LD ---
00007 LD 00004
00008 AND NOT 00005
00009 OR LD ---
00010 OUT 10000
To Next Page
Loading...
