391
M1
M1
M2
Disable Contact
0
D0 – D9
M0 – M7
D10
1
2
1
2
3
Item No.
Station No.
Device Range
7-3-7 CPU Link
(11+The number of data bytes to be transmitted)×11
Baud rate ( bps)
+20µs
( 11+( 10×2) )×11
38400
+20µs=8.88ms+20µs=8.9ms
( 11+( 1) )×11
( 11+( 1×2)) ×11
38400
38400
+20µs=3.44ms+20µs=3.46ms
+20µs=3.72ms+20µs=3.74ms
=8.9ms+3.46ms+3.74ms=16.1ms
CPU LINK
St. #1
CPU LINK
St. #2
RS- 485
CPU LINK
St. #1
CPU LINK
St. #2
CPU LINK
St. #n
RS- 232
VS series
PLC
VS series
PLC
VS series
PLC
VS series
PLC
VS series
PLC
The VS Series PLC uses this application to share instant data between VS PLCs to serve the purpose of distributed
control.
When the communication ports of VS PLCs have been set the application for to share instant data between PLC’s,
select one of the PLC to cooperate with the CPUL instruction and CPUL communication table, through its particular
protocol to share instant data.
Selectable: 300/600/1200/2400/4800/9600/19200/34800/57600/115200 bps.
Half-duplex
Up to 15 meters
Non-isolated: 50 m.; Isolated: 1 km.
1 Slave station only
Max. 255 stations (For more than 32, add
repeater(s) in the circuit is required)
CP2~CP5: VS-D232-EC
CP3, CP5: VS-D52A-EC(CH2)
CP1: Main Unit built-in
CP2~CP5: VS-D485-EC, VS-D485A-EC
CP2, CP4: VS-485-EC, VS-485A-EC, VS-D52A-EC(CH1)
CP3, CP5: VS-ENET-EC(CH2)
VS Series PLC (including VS1, VS2, VSM and VS3)
All the X, Y, M, S, T, C, D, R are included
Item
Specification
RS-485RS-232Communication Interface
Communication Protocol
Commection Method
Baud Rate
Distance
No. of Slave Stations
Linking Equipment
Available Model
Transferable Device
CPU Link particular protocol
The spending time of the rst item set is:
The spending time of the second item set is:
The spending time of the third item set is:
The communication turnaround time (TAT) is the total time taken when the rst, second and third communication item
sets are completed.
Example: The communication baud rate is
38,400 bps. As the communication
table at the right shows, there are
three item sets. Then the
communication turnaround time
(TAT) is calculated as follows:
The most of the VS Series PLC communication application types are replying at the particular time that is when the
PLC is nished its user program cycle. Thus, the spending time of entire communication does not only depend on
the baud rate, but also affected by the PLC’s Scan Time. Therefore, it is not easy to calculate the communication
turnaround time.
The CPU Link proceeds the communication by the way of immediate interrupt and thus its communication response
is the fastest. Also, the communication turnaround time (TAT) can be calculated. Therefore, it is suitable for a
distributed control system which needs to be quickly responded.
The calculation of the communication turnaround time (TAT) is introduced below:
The communication turnaround time is the total time to complete all the item sets in the communication table
(excluding disabled item set).
The calculation of the time for each communication item set is introduced below:
Word/Bit
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