Mitsubishi Electric MELSEC iQ-RJ71C24-R4 - Page 288

286
15 DATA COMMUNICATIONS USING USER FRAMES
15.2 Data Reception
■Combination with the start frame (Timing patterns for data reception start and data reception
complete (read))
When data is received using Method 1, C24 checks again whether the start frame has been received after
receiving data equaling the 'method 1 dedicated receive end data quantity'. Reception data during that time is
ignored.
(For data reception with format-0)
Pattern No. 1-A 1) Pattern No. 1-A 2)
First frame Last frame First frame Last frame
Target device
Arbitrary data Arbitrary data
CPU module
Equaling the
received data
count
For the
received data
count
Pattern No. 1-B
First frame Last frame
Target device
CPU module
Pattern No. 1-C 1) Pattern No. 1-C 2)
First frame First frame
Target device
Arbitrary data Arbitrary data
CPU module
For the received
data count
For the received
data count
For the received
data count
(For data reception with format-1)
Pattern No. 1-D
First frame First frame
Target device
Arbitrary data
Arbitrary data
Receive data
CPU module
For received data count
for format 1 only
For received data count
for format 1 only
Ignored
Pattern No. 1-E
First frame First frame
Target device
Receive data
: Reception start timing
: Receive complete timing (read timing)
CPU module
When received data count
for format 1 only is 0
Ignored