X/Y Data Flow In Remote Channels - Mitsubishi Electric Melsec-k Instruction Manual

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4. PROGRAMMING
4.5.2 X/Y data flow in remote channels
Master channel (K3NCPUP2) Remote channels
K3NCPU Optical data link card #I # I2
Fig.
4.7 X/Y Data Flow in Remote Channels
(In case of a total of 32 channels linked with 32 X points and 32 Y
PO
p
arrives
X/Y data flow as shown by the thick lines in Fig. 4.7.
(1 ) Process time
The operation of 0 step t o OUT F l O O is repeated. After this OUT FIOO, the K3NCPUP2 makes
data communication with the optical data link card 2, and thereafter, gives the optical data link
card a sendinglreceiving command to/from the remote channels, and
a t
the same time, executes
the operation of 0 step t o OUT F l O O again. Therefore, the process time is longer by the data
communication time with the optical data link card (approximately 5
ms
when X / Y points are
2048).
(2) Transmission delay time
The output of K3NCPUP2 is sent to the remote channels after the next OUT FIOO. If this
output changes in the vicinity of step number 0, the sending delay time to channel number 32 i s
(1 cycle of K3NCPUP2
+
34 ms).
This 34 ms is the value obtained by the addition of the data communication time between
K3NCPUP2 and optical data link card and the sending time to channels number 1 to 32 when
the number of X/Y link points i s 2048. Reversely, if the output changes after the sending/
receiving of input signal of remote channel (channel number I ) , the transmission delay time is 3
cycles of K3NCPUP2.