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Prior to Sequence Program Creation
4
PLC FUNCTION
4.2.4 Sequence program write
When rewriting the PLC function parameters and sequence program using GX
Developer, check the following:
1)Check that the sequence program execution key is in the STOP position (signal SQ-
SD is off) (refer to page 100).
2)Check that the inverter is at a stop (RUN indicator is off) (refer to page 42).
3)Check that the communication specification setting parameters (Pr. 332 to Pr. 336)
are set correctly (refer to page 98). If any of these parameters is set incorrectly,
communication with GX Developer cannot be made.
4)Check the PLC series and sequence program capacity in the GX Developer
parameters (refer to page 98).
5) Refer to the GX Developer manual and write the sequence program.
POINT
Sequence program write can be performed in any operation mode. (Refer to
page 75.)
REMARKS
Though the communication specification parameters (Pr. 332 to Pr. 336) are
factory-set to enable communication with GX Developer, use the parameter unit
(FR-PU04) to confirm and/or rewrite them. (Refer to the FR-PU04 instruction
manual for the handling of the FR-PU04.) GX Developer and the FR-PU04 cannot
be connected and used simultaneously.
CAUTION
•A sequence program cannot be written with its steps specified. If written,
the sequence program does not run. (The program outside the specified
range is initialized.)
•Do not read the built-in PLC function parameters and sequence program
without writing them to the inverter once using GX Developer. Since the
inverter does not have normal data, always write the built-in PLC function
parameters and sequence program once.
•Since the built-in PLC function parameters and sequence program are
written to the flash ROM, there are restrictions on the number of write times.
(Approximately 100,000 times)