m. To “release” the latched Bit No. 898 from its “Logic 1” state, enter a com-
mand of
RLS 898 [CR]
The display of Bit No. 898 should now read “LOW.”
We also want a “LESS THAN” limit condition for Channel No. x to set Bit No.
899 to “Logic 1,” but in a N
ONLATCHING fashion. That is, we want Bit No. 899
to revert automatically to a “Logic 0” state as soon as the low-limit violation of
Channel No. x ceases to occur. The
RLS command need not be applied to
reset Bit No. 899, as it was to the latching Bit No. 898, above.
n. Enter from the keyboard a command of
LLT x = 899 [CR]
Bit No. 899 is now automatically assigned a “logic source” of “LIMIT, NON-
LATCHING.” NO PREVIOUS
LOGIC SOURCE (SRC) COMMAND NEEDS
TO HAVE BEEN APPLIED TO BIT NO. 899, AS IT WAS FOR THE “LIMIT,
LATCHING” SOURCE OF BIT NO. 898 (Section 12.a, Step 7, above).
REMEMBER: The reference to any logic bit by one of the three “LIMIT
LOGIC” commands (
LGT, LLT, or LBT) automatically sets the source of
that bit to “N
ONLATCHING LIMIT LOGIC.”
o. Verify the effectiveness of the above
LLT command by removing all load
from Channel No. x’s source transducer and observing the resultant dis-
play of Bit No. 899 (it should now read “HIGH”).
p. Increase the transducer load until it is greater than the low-limit value, but
less than the high-limit value. The display of Bit No. 899 should change
from “HIGH” to “LOW” as soon as the data reading for Channel No. x rises
above the low-limit value.
q. To
cancel the “GREATER THAN” and “LESS THAN” LOGIC you have set up
for Channel No. x, enter the following commands:
LGT x = N/A [CR]
LLT x = N/A [CR]
The presence of a “GREATER THAN” or “LESS THAN” limit condition for
Channel No. x will now have no effect on the state of any system logic bit,
including Bit No. 898 or 899.
B - 29
LIMIT SETUP
“O
NTHE
A
IR
” (B-S
IZED
)
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