19.8 Precautions

Connecting GT16 and GT15 in multi-drop connection

(1)Standard monitor OS installation, Writing Communication driver

When connecting GT16/GT15 in multi-drop connection, the writing of the standard monitor OS and communication driver to the GOT from GT Designer3 (Version 1.12N or later), as well as the writing of the standard monitor OS and communication driver to the serial multi-drop connection unit are required.

(2)Device specification

Network No. and station No. are not supported.

Station number setting on GOT

Set each station number so that no station number overlaps.When the station No. is duplicated, the GOT whose station No. is duplicated cannot be monitored normally.

The station number can be set without regard to the cable connection order.There is no problem even if station numbers are not consecutive.

Station

Station

Station

No.3

No.0

No.15

The example of a Station No. setting

Extended/Option function of GOT

The extended/option functions of GOT shown below are not available.

System monitor, Device monitor, Ladder monitor, A list editor, FX list editor, Intelligent unit monitor, Network monitor, Q motion monitor, Servo amplifier monitor, CNC monitor, Backup/restore, CNC data I/O, SFC monitor, Ladder editor, Log viewer, MELSEC-L troubleshoot, Motion SFC, motion program (SV43) editor, Motion program (SV43) I/O

System alarm (GT16, GT15, GT14, GT11)

The alarms of the serial multi-drop connection unit are displayed on the system alarm.The alarms of the connected PLC are not displayed.

Activating the serial multi-drop connection unit

The master module detects a slave GOT, which is connected, at the startup.It may take time to detect again the slave station which is not detected at this point.Activate the master module in the condition that a communication can be made after the startup of the slave GOT.

Using the multi-drop connection in the multi- channel configuration

If a communication timeout error occurs when using the multi-drop connection in the multi-channel configuration, set the send delay time to the serial multi-drop connection unit side.

■ Communication detail settings

Device update cycle

•When the number of connected slave GOTs and the device points of each GOT increase, the device update cycle on the screen may get slower. In such a case, it is recommended to reduce the device points of each GOT. (Please consider 250 points as a guide of 1 GOT, and 750 points as a guide of the total points.) In addition, when a timeout error occurs, make the timeout time longer in the communication settings of the slave GOT.

•When the device number is set randomly, the device update cycle becomes slower compared to the case that the device number is set consecutively.Therefore, it is recommended to set the device number consecutively.

•Depending on the device points or combination, it may take time to switch the screen.At this time, the device update cycle of other slave station is also affected.

FA transparent function

FA transparent function is available for each GOT in the GOT multi-drop connection system.

(1)Standard monitor OS installation, Writing Communication driver

When using FA transparent function in GOT multi-drop connection, the writing of the standard monitor OS and communication driver to the GOT from GT Designer3 (Version 1.18U or later), as well as the writing of the standard monitor OS and communication driver to the serial multi-drop connection unit are required.

(2)Number of personal computers

Only one personal computer can be connected to the multi-drop connection system.

Only one personal computer

(3) Monitor speed of GOT

The monitoring performance slows down according to the number of monitoring GOTs. While using FA transparent function, the monitoring performance of the whole multi-drop system decreases. As a result, timeout error may occur in GOTs in the system.

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19. GOT MULTI-DROP CONNECTION

 

19.8 Precautions