HEIDENHAIN TNC 426 CB, Technical Manual

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December 2001 PLC Modules 7 – 179
Module 9020/9021/9022 Write in the word range
The TNC writes the given byte, word or double word to the defined location in
the word memory. Indexed writing is possible by specifying a variable as
designation of the memory location.
Call:
PS
B/W/D/K <Address of the byte to be written>
PS B/W/D/K <Byte to be written>
CM 9020 ; WRITE BYTE TO ADDRESS
PS B/W/D/K <Address of the word to be written>
PS B/W/D/K <Word to be written>
CM 9021 ; WRITE WORD TO ADDRESS
PS B/W/D/K <Address of the double word to be written>
PS B/W/D/K <Double word to be written>
CM 9022 ; WRITE DOUBLE WORD TO ADDRESS
Error recognition:
Example of
Module 9020 Initial state:
Byte
B10 = 35 (address)
Byte B100 = 120 (byte to be written)
Byte B35 = ?
Marker Value Meaning
M4203 0 Byte was written
1 Error code in W1022
W1022 3 Invalid address was programmed
5 Module 9021: Specified address is not a word address
Module 9022: Specified address is not a double word
address
Function STL Accumulator content (dec) Data stack (dec)
x x x x x x x x
Save the address
(B10) of the byte to
be written from the
word accumulator to
the data stack. PS B10 3 5 3 5
Save byte B100 from
the word
accumulator in the
data stack. PS B100 1 2 0 1 2 0
Write data stack in
byte B35. CM 9020 1 2 0