Automating Manufacturing Systems - Process Control and ...

plc function ref - 34.39
AEX - Ascii string EXtract
A
Description:
AEX
STRING EXTRACT
Source ST9:4
Index 11
Number 3
Dest
ST9:0
This function will remove part of a string. In this example the characters
in the 12th, 13th and 14th positions (’3’ charaters starting at the 11th
position), are copied to the location ST9:0. The original string is not
changed.
Status Bits:
Registers:
none
none
Available on: Micrologix, PLC-5
AHL - Ascii Handshake Line
A
AHL
ASCII HANDSHAKE LINE
Channel 1
AND Mask 0000
OR Mask 0003
Control R6:1
Channel Status
Description:
This instruction will check the serial interface using the DTR and RTS
send bits. Bit 0 is DTR and bit 1 is the RTS. If a bit is set in the AND
mask the bits will be turned off, otherwise they will be left alone. If a
bit is set in the OR word a bit will be turned on, otherwise they will be
left alone. In this example the DTR and RTS bits will be turned on for
channel 1.
Status Bits:
EN
DN
ER
enable - this is set when the instruction is active
done - when the bits have been reset this bit is on
error - this bit is set if an error has occurred
Registers:
none
Available on: Micrologix, PLC-5
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