Cautions On Connecting Two Or More Got Units; Power On Sequence - Mitsubishi Electric F920GOT-K Hardware Manual

GOT-F900 SERIES (CONNECTION)
7.5

Cautions on Connecting Two or More GOT Units

This section explains the cautions on use of two or more connected GOT units.
7.5.1

Power ON Sequence

When connecting two or more GOT units, confirm the model of the connected equipment (FX/A/QnA/Q
Series PLC, microcomputer) by executing communication in turn from the first GOT-F900 unit (1st GOT-
F900 → 2nd GOT-F900 → 3rd GOT-F900 → 4th GOT-F900).
For example, if the power is turned on in the 1st and 4th GOT-F900 units, then turned on in the 2nd and
3rd GOT-F900 units after a while, a communication error occurs in the 4th GOT-F900 unit.
And even when the power is turned on in four GOT-F900 units at the same time, if communication starts
as soon as the opening screen is displayed in the GOT units and it takes considerable time until
communication is enabled in the 4th GOT-F900 unit, a communication error may occur.
1) Communication timing
If communication is aborted for some reason, it is retried. If communication is not executed in the
specified judgement time, a communication error occurs.
Power supply
(24V DC)
supplied to GOT
1st GOT
Communication
2nd GOT
Communication
3rd GOT
Communication
4th GOT
Communication
2) Countermeasures
To prevent communication errors, the communication start timing in the GOT-F900 should be
delayed using the following method.
a) Delay the timing of turning on the power of the GOT-F900 and the connected equipment (FX/A/
QnA/Q Series PLC, microcomputer).
Set the sequence to "connected equipment → 1st GOT unit → 2nd GOT unit → 3rd GOT unit →
4th GOT unit".
b) While the opening screen is being displayed, communication is not executed.
Accordingly, adjust the opening screen display time to delay the communication start timing.
Change the title screen display time on the "SET-UP MODE" screen in the GOT or in the screen
creation software.
1st GOT unit (default value) → 2nd GOT unit (default value + 5 sec) → 3rd GOT unit (default
value + 10 sec) → 4th GOT unit (default value + 15 sec)
The opening screen is
displayed.
Connection of Two or More GOT Units 7
Communication is enabled in the 2nd unit.
A user screen is displayed.
Communication is enabled in the 3rd unit.
A user screen is displayed.
Retry
Communication is enabled in the
4th unit.
A user screen is displayed.
Retry
Retry error
The error screen is
displayed.
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