7 REPLACEMENT OF PROGRAM
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7.7.7 Index register
(1) Replacing index register
"Z, Z1 to Z6, V, V1 to V6" and "Z0 to Z15" are used as index register for the AnS series and Q series,
respectively. Therefore, their specifications differ.
"V" is used as edge relay for the Q series. The device is used to memorize the PLS/PLF information to
contacts from the start of the ladder block.
The following table shows replacement of index register when AnS series program was utilized to the Q
series with "Change PLC type".
When modifying contact instructions of timer/counter with indexes, AnA/AnUCPU has no restrictions on
index registers.
For QCPU, only "Z0, Z1" can be specified for index registers when modifying contact instructions of
timer/counter with indexes according to its specifications.
When using index registers other than "Z0, Z1" in the existing AnA/AnUCPU, it is replaced with
"SM1255" as unconvertible instruction. Therefore, correcting/changing program is required.
AnS series Q series
ZZ0
Z1 to Z6 Z1 to Z6
VZ7
V1 to V6 Z8 to Z13
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