GE IC697MDL750 Spare Parts System Module
Technical data of product parameters
When the rung goes from false-to-true, the Enable bit (EN) is set. When the
instruction is placed in the ASCII queue, the Queue bit (EU) is set. The
Running bit (IN) is set when the instruction is executing. The Done bit (DN)
is set upon completion of the instruction. IC697MDL750
The processor determines the number of characters in the buffer and puts this
value in the position field of the control block. The Done bit (DN) is then set.
If a zero appears in the characters field, no characters were found.
When the program scans the instruction and finds the Done bit (DN) set, the
processor then sets the Synchronous bit (EM). The EM bit acts as a secondary IC697MDL750
done bit corresponding to the program scanThe processor searches the source (file type ST) for the first character between
0 and 9. All numeric characters are extracted until a non-numeric character or
the end of the string is reached. Action is taken only if numeric characters are
found. If the string contains an invalid length (<0 or >82) the ASCII Error bit
S:5/15 is set. Commas and signs (+, -) are allowed in the string. However, only
the minus sign is displayed in the data table.
The extracted numeric string is then converted to an integer. The ASCII Error
bit S:5/15 is set if the string contains an invalid string length. The value of
32,767 is returned as the result. IC697MDL750
This instruction also sets the arithmetic flags (found in word 0, bits 0-3 in the
processor status file S:0).
Use this instruction to clear an ASCII buffer. ASCII instructions are removed
from the queue and then the Error bit (ER) is set. This instruction clears the
ASCII buffers immediately upon the rung transitioning to a true state. The
instruction works when the channel is in User Mode or System Mode
configured for DF1 Full-duplex or Half-duplex drivers. In System Mode, only
the ASCII transmit buffer can be cleared.
For OS Series C, FRN 7 and higher, the ACL instruction can also be used to
clear the DF1 communication buffers when the channel is configured for any
of the DF1 communication drivers. Select 0 for the channel number and Yes
for both the receive and transmit buffers. When the ACL instruction is
executed, any pending outgoing DF1 replies, incoming DF1 commands, and
outgoing DF1 commands are flushed. Any MSG instructions in progress on
that channel will error out with an error code of 0x0C. The DF1
communication buffers are cleared at end-of-scan or during REF instruction
execution.
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