plc noob
Member
Is it possible to compare an ascii value in an 06 plc to a bcd value entered from an hmi ? or can the ascii be converted to bcd ? And the standard compare functions used . How would this convert to bcd ?
DL06 Ascii to Bcd
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bernie_carlton
Lifetime Supporting Member + Moderator
As far as I can tell the AEX simply moves portions of an ASCII string from one location to another with various options. it doesn't appear to interpret an ASCII string into a number (like ACI in Allen Bradley). In fact I don't see any instruction which performs this. I have only done this (ASCII -> number conversion) in a BASIC module to pre-process a received string from a barcode reader then sent the processed number to the CPU.
If the string is short enough you could work out a character-by-character work around.
If the string is short enough you could work out a character-by-character work around.
Clay B.
Lifetime Supporting Member
bernie_carlton said:
Thats what I got. You can do CMPV. That will do a direct compare between adress to a specified length. It is a ture false condition. If both groups mztch the SP61 is set to 1.
Someone else may know this better than me but I think I remeber that SP61 is used by several other functions as well so you probaly need to keep that in mind when you use the CMPV instruction.
Dua Anjing
Member
The ASCII digits 0 thru to 9 are represented in HEX by 30 thru to 39. You could subtract 30(HEX) from ASCII digit( in HEX) and then convert from HEX to BCD.
cjh
Member
Look in the user manual at the ATH instruction (5-90).
This will convert ASCII from one set of V memory to BCD in another set of V memory.
So if you had 3132 in the source V memory (hex equivalent to "12") it would show up as 12 in the destination V memory in BCD/Hex format.
That should make it easier to compare.
This will convert ASCII from one set of V memory to BCD in another set of V memory.
So if you had 3132 in the source V memory (hex equivalent to "12") it would show up as 12 in the destination V memory in BCD/Hex format.
That should make it easier to compare.
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