Plc Setting For Performing Data Communication; Precautions On Data Communication - Mitsubishi MELSEC-F User Manual

8 COMMUNICATION USING MC PROTOCOL

8.1.4 PLC setting for performing data communication

8.1.5 Precautions on Data Communication

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Data communication via MC protocol is enabled by adjusting the following settings
using FX Configurator-EN (GX Developer) and writing the parameters to the Ethernet
module.
1) Initial settings (see Section 5.2)
2) Open settings (see Section 5.5)
This section explains some precautions that should be observed when performing data
communication between an external device and the Ethernet module.
(1) Precautions that should be observed when performing data
communication via the Ethernet module
(a) Perform read/write only when the buffer memory status of Ethernet module is
the following.
Initial normal completion signal (BFM# 27 [0001H])
Open completion signal of the connection is used (BFM#20480·corresponding bit)
If the buffer memory status is the above, it is possible to communicate from an
external device using MC protocol regardless of whether or not a sequence
program is used.
(b) Use the automatic open UDP port. Alternatively, use the passive open
connection set to "Always wait for OPEN" (BFM#24 b8:ON) in the initial
timing setting in the operation settings.
(c) When not selecting the open 0 connection's communication parameter
setting, "MC Protocol Usable" (BFM #32 b10: ON), communication using
MC protocol cannot be performed.
To set this using FX-Configurator-EN (GX Developer), select the open
settings from the initial screen, and select [Procedure exists (MC)] in [Fixed
buffer communication procedure].
(d) Replacing the Ethernet module
The Ethernet address (MAC address) differs depending on the device.
When the Ethernet module is replaced due to breakdown, reboot any
external devices also.
Similarly, reboot the Ethernet module even when an external device is
replaced (such as a personal computer).
MELSEC-F
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