Cautions On Use Of Fx-2Pif - Mitsubishi Electric F920GOT-K Hardware Manual

GOT-F900 SERIES (CONNECTION)
23.3.4

Cautions on Use of FX-2PIF

When using the FX-2PIF connected to the GOT-F900 for monitoring, observe the following cautions on use.
1) Access to PLC CPU through FX-2PIF
a) The access from the dedicated equipment (GPP function) or GOT is enabled only when the PLC
is connected with the FX-2PIF.
Because of the restriction in communication time, access to another MELSECNET PLC station is
not possible. A communication error (time out error) will occur.
Example: IF a GOT tries to access a different PLC station, an error occurs in the communication
between the dedicated equipment (GPP function) and the PLC.
b) When using FX-2PIF, the response speed from the PLC CPU to the GOT or dedicated equipment
(GPP function) is approximately four or five times slower than when it is not used. The same
situation exists when either the GOT or dedicated equipment (GPP function) is connected to the
FX-2PIF.
2) Operation of dedicated equipment (GPP function) through FX-2PIF
a) The circuit monitor by the GPP function is available to monitor 103 points (*1).
*1 Includes the monitor points of RUN/STOP status of the PLC and scan time counted by the
special data register. An error will not occur even though the number of devices being
monitored exceeds 103, however, the extra devices are not monitored correctly.
b) While the GPP function is being used for monitoring timer/counter settings of the PLC CPU, it
displays the original set value even after a change is made by the GOT. In such a case, the program
should be read from the PLC CPU so that the latest set value is displayed. The display of the set
value in the PLC CPU and the GOT is changed if any setting change is made using the GOT.
Appendix 23
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