Yaskawa VS-616G5 Modbus Plus Communication Card - Manual (Page 16)

3-6 Installation of the MB+ Board
Cable Loss Detection
A cable loss occurs when the ‘master’ (controlling node which initiates transactions) drops out of
the token rotation sequence. The MB+ board continuously monitors the network for the ‘master’
node.
Switch 7 is used to enable the Cable Loss Detection.
Function Description MB+ SW1-7
Position
Cable Loss Detection Enabled 1 = ON
Cable Loss Detection Disabled 0 = OFF
When the Cable Loss Detection is enabled, a communication loss will generate a fault and display
an “ EF0 ” fault code on the Digital Operator.
How the VS-616G5 handles this fault is configured by setting of drive parameters F9-03 and F9-02.
Cable Loss Detection is not activated immediately on power-up. The function is enabled (with
SW1-7 ON) after the first command (non-global) is given to the drive.
A Cable Loss Fault ( EF0 ) is a configurable fault using the F9-xx parameters.
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If configured to F9-03 (alarm only) and F9-02 (during run), the cable loss fault ( EF0 ) is
disabled even with SW1-7 ON.
Global Read Function
Switch 8 is used to enable the Global Read Function.
Function Description MB+ SW1-8
Position
Global Read Function Enabled 1 = ON
Global Read Function Disabled 0 = OFF
When the Global Read Function is enabled, the drive provides eight registers of data to the PLC
on the network. The drive automatically and continuously sends this Global Read Data when it
has the token. The PLC only reads this data when requested by the ladder logic (through the
execution of a Global Read MSTR Function). Chapter 7 expands on the details of the Global
Read Function.
Note: The Global Write Function is not affected by the setting of SW1-8.