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MELSEC-F
COMMUNICATION USING MC PROTOCOL8
8 - 4
8.1.4 PLC setting for performing data communication
Data communication via MC protocol is enabled by adjusting the following settings
using FX Configurator-EN and writing the parameters to the Ethernet module.
1) Operational settings (see Section 4.6.)
2) Initial settings (see Section 5.2)
3) Open settings (see Section 5.5)
8.1.5 Precautions on Data Communication
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 [0001
H])
If the open completion signal (corresponding bit of BFM#20480) of the used
connection is ON (open completion status), it is possible to communicate
from an external device using MC protocol without regard to the existence of
a sequence program.
(b) Use the UDP connection set to "Always wit for OPEN (BFM #24 b8: ON)" in
the initial timing setting in the operation settings. Or use the passive open
connection in the case of TCP.
(c) When not selecting the open 0 connection's communication parameter
setting, "MC Protocol Usable" (BFM #32-39 b10, b9:10), communication
using MC protocol cannot be performed.
To set this using FX-Configurator-EN, 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).