Filter
Top Products
5 - 20
MELSEC-F
COMMUNICATION PROCEDURE5
5 - 20
(3) Fixed buffer
(connection numbers 1 to 8; BFM#32 to 39 b0)
(a) Here it is selected whether the fixed buffer corresponding to each applicable
connection number will be used for sending or receiving when
communicating using the fixed buffers.
(b) When both sending and receiving are performed with an external device
using fixed buffer communication, one buffer for sending and one for
receiving are required. Thus, two connections should be set.
(c) Whether the fixed buffers are set for sending or receiving, external devices
can communicate using MC protocol.
(4) Fixed buffer communication
(connection numbers 1 to 8; BFM#32 to 39 b9 to b10)
(a) For this item, select the communication method when communicating using
the fixed buffers.
(b) When communicating using MC protocol, adjust the setting of the fixed
buffer communication procedure to [Procedure exist (MC)].
In the settings other than [Procedure exist (MC)], communication using MC
protocol cannot be performed.
(c) Communication using MC protocol with one external device is available in
one connection when [Procedure exist (MC)] is selected.
For simultaneous connections with multiple external devices, perform the
setting for all external devices. Up to 4 connections can be set. However, the
available number of connections decreases accordingly if [MELSOFT
connection] is set as usable in the open settings.
Name of setting Description of setting
Send For sending or fixed buffer communication is not executed.
Receive For receiving.
Name of setting Description of setting
Procedure exist
• In fixed buffer communication, data is communicated in 1:1 by handshaking with the
external device.
Procedure exist (MC)
• In fixed buffer communication, 1:1 data communication is performed by handshaking with
the external device.
• Communication using MC protocol can be performed.
No procedure
• The no procedure fixed buffer communication uses dedicated connections.
• The PLC and external devices communicate data in 1:1
• The handshaking with an external device must be performed using a sequence program.
The number of connections to MELSOFT products +
Number of connections which have MC protocol operational 4