Automating Manufacturing Systems - Process Control and ...

plc function ref - 34.42
AWT, AWA - Ascii WriTe, Ascii Write Append
A
AWT
ASCII WRITE
Channel
Source
Control
String Length
Characters Sent
0
ST11:9
R6:3
14
Description:
The AWT instruction will send a character string. In this example, when
’A’ goes from false to true, up to 14 characters will be sent from
’ST11:9’ to channel 0. This does not append any end of line characters.
The AWA function has a similar operation, except that the channel configuration
characters are added - by default these are ’CR’ and ’LF’.
Status Bits:
EN
DN
ER
UL
EM
EU
enable - this will be set while the instruction is active
done - this will be set after the string has been sent
error bit - set when an error has occurred
unload -
empty - set if no string was found
queue -
Registers: POS the number of characters sent instructions
Available on: Micrologix, PLC-5
34.2 DATA TYPES
The following table describes the arguments and return values for functions. Some
notes are;
• ’immediate’ values are numerical, not memory addresses.
• ’returns’ indicates that the function returns that data value.
• numbers between ’[’ and ’]’ indicate a range of values.
• values such as ’yes’ and ’no’ are typed in literally.
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