2.PMC SPECIFICATIONS B-63983EN/01
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2.5 COMPATIBILITY WITH CONVENTIONAL MODELS
2.5.1 Compatibility with the PMCs for the 16i/18i/21i-B
30i/31i/32i-A PMC is highly compatible with the PMC-MODEL SB7
(PMC-SB7) and PMC-MODEL SA1 (PMC-SA1) for the Series
16i/18i/21i-MODEL B (16i/18i/21i-B) on the source level.
Table 2.5.1 Compatibility with the PMCs for the Series 16i/18i/21i-MODEL B
30i/31i/32i-A
Model
First PMC Second PMC
(option)
Third PMC
(option)
Dual-check
safety PMC
(option)
PMC-SA1 ¡¡¡¡
PMC-SB7 ¡ ▲▲▲
(¡: Upward-compatible. ▲: Partly compatible)
Transporting programs require modification because the specifications
of the following functions have been changed.
(1) In case of PMC-SB7 and PMC-SA1, 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-SB7, the basic instruction execution speed is 33
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-SB7 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) For the PMC-SB7 and PMC-SA1, the timer precision defined
with the TMR functional instruction is fixed at a certain value.
For the 30i/31i/32i-A PMC, the timer precision can be set up for
each timer number separately. See Subsection 4.3.1 for details.