Keyence N-400 User Manual download pdf (Page 125)

117

Chapter 6 PLC Link

6.5 Communication Time

Even in PLC link mode, the RS-485 communication between the N-400 and each

BL series is regarded as the same as standard mode serial communication. (

➮

See

pp. 83 to 85.

)

The time required for the RS-232C communication between the N-400 and the

PLC is described below:

This communication time may change depending on the PLC’s scan time and the

model of the PLC.

■ Time required for RS-232C data transmission in PLC link mode

The time required for data transmission from the N-400 to the PLC is as follows:

This time duration corresponds to the “RS-232C data transmission time in multi-

drop link mode” (B) described on p. 84. To obtain the total communication time,

add the “RS-485 data transmission time” (A) described on p. 82.

* When the RS-232C communication baud rate is 9600 bps:

■ Communication time to start reading using reading trigger area

To control the BL series’ reading operation using the reading trigger area, enter the

trigger ON command on the PLC, and obtain the time duration until the command

is received by the N-400.

This time duration corresponds to the “RS-232C command transmission time”(C)

described on p. 84.

To obtain the total communication time, add the “RS-485 command transmission

time” (D + b) described on p. 84.

* When the RS-232C communication baud rate is 9600 bps:

Number of data digits MELSEC-A SYSMAC-C KV(KV mode)

10 Approx. 300 ms Approx. 350 ms Approx. 500 ms

20 Approx. 350 ms Approx. 400 ms Approx. 750 ms

32 Approx. 400 ms Approx. 500 ms Approx. 1050 ms

Number of MELSEC-A SYSMAC-C KV(KV mode)

connected BL series

1 Approx. 150 ms Approx. 150 ms Approx. 100 ms

31 Approx. 400 ms Approx. 600 ms Approx. 1.5 s

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 149 150

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Keyence N-400 User Manual Page 125