2.PMC SPECIFICATIONS B-63983EN/01
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2.5.2 Compatibility with the PMCs for the 15i-A/B
30i/31i/32i-A PMC is compatible with the PMC-MODEL NB6
(PMC-NB6) for the Series 15i-MODEL A/B (15i-A/B) with respect to
instructions on the source level except for some functions. The
specifications of these functions have been changed, thus requiring
modification in transporting programs. In addition, the arrangement
and specifications of the DI/DO signals (addresses G and F) used with
the CNC vary between the 30i/31i/32i-A and 15i-A/B. For their
sequences, it is necessary to modify signal addresses and control logic.
(1) In case of 15i-A/B, the first level execution period is fixed at 8
msec. In case of 30i/31i/32i-A PMC, it can be switched between 4
and 8 msec, using a CNC parameter.
(2) In case of PMC-NB6, the basic instruction execution speed is 85
ns/step. In case of 30i/31i/32i-A PMC, it is 25 ns/step.
(3) As the execution speed of instructions become fast, the following
items about execution timing may be changed.
- The execution cycle of both first and second level of ladder
- The timing of the execution cycle of first level of ladder
according to the partition of second level ladder
- The timing between ladder execution and I/O transfer
The working test of the machine is necessary.
(4) The used size of system, some functional instractions and
symbol/comment(extended type) are changed. Generally, the
program size of 30i/31i/32i-A PMC becomes bigger than one for
PMC-NB6 even if the same source program is converted. If the
program size exceed the capacity of the flash ROM, please change
the ladder step option or reduce the symbol and comment.
(5) In case of PMC-NB6, the timer precision defined with the TMR
functional instruction is fixed at a certain value. In case of
30i/31i/32i-A PMC, the timer precision can be set up for each
timer number separately. See Subsection 4.3.1 for details.
(6) The arrangement and specifications of the DI/DO signals
(addresses G and F) used with the CNC vary between the
30i/31i/32i- A and 15i-A/B. Refer to the respective connection
manuals.
(7) The nonvolatile memory control keep relay (MWRTF and
MWRTF2) has been changed from K16 to K909.
(8) The SPCNT functional instruction is not supported. It is treated
as a NOP.