Yaskawa VS-616G5 Modbus Plus Communication Card - Manual (Page 80)

10-4 Application Notes
Limitations
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The VS-616G5 with the Modbus Plus Interface board is seen as a slave device on the MB+
network.
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If global write is enabled via F200, the operation command (001h) and frequency reference
(002h) must come via a global write, otherwise erratic operation of the drive could result.
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With the cable loss detection switch on, cable loss is not detected, after drive power-up, until
the drive’s Modbus Plus Interface board receives its first MB+ command (either a non-global
read or write).
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If both run forward (word 001h - bit 0) and run reverse (word 001h - bit 1) are set to 1, an “
EF - External Fault ” will be generated by the drive.
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The following registers can only be accessed via one word blocks (MSTR length=1):
F200 r/w Global Write Data Node Number (Global Write Enable)
F201 r/w Global Frequency Reference Multiplier
F202 r Model Number of Drive
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If any registers are changed via MB+, with the exception of the Operation parameters (shown
in Appendix A2 of the VS-616G5 Installation & Quick-Start Manual), an ‘ACCEPT’ or ‘ENTER’
command must be sent to the drive in order for the drive to be given a RUN command.
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If any registers are changed via MB+, an ‘ACCEPT’ or ‘ENTER’ command must be sent to the
drive in order for parameters to be changed via the drive’s keypad. If an ‘ACCEPT’ or
‘ENTER’ command is needed, the drive will display “Busy - Write Protected” when a
parameter is attempted to be changed via the keypad.
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Limit your use of the ‘ENTER’ command. The life of the Non-Volatile EEPROM on the VS-
616G5 will support a finite number of operations. This means that the ‘ENTER’ command can
only be used a maximum of 100,000 times to store data in the EEPROM. After the specified
number of operations, the EEPROM may fault (ERR), requiring the VS-616G5 to be replaced.