3-5. Communication Function
The VS-12PB permits target positions and parameter settings to be specified from a programmable controller or
a personal computer by using this communication function. For details, please contact your NSD sales
representative. Moreover , as shown in the illustration below, up to 32 VS-12PB units can be controlled from a
single host programmable controller.
3-6. Self-Diagnosis Function
(1) Travel Detection and Travel Direction Error Detection Functions
Changes in the current position detected (every 0.5s) by the ABSOCODER sensor are checked to verify that
travel is occurring in accordance with the controller commands.
The interval between a positioning start and the point when error detection begins is determined by parameter
settings ( “no travel” detection timer, and “travel direction error” detection timer).
(2) STOP zone Upper / Lower Limit Over Detection Function
In cases where the STOP zone has been adjusted by the Learning function, this function checks the adjustment
amount to determine if it exceeds the pre-designated upper or lower STOP zone limit.
(3) Excessive Current Position Change Detection Function
The amount of current position change is checked every 20ms. This function detects cases where the amount
of change exceeds the “permissible current position change amount” designated by parameter No.65.
(4) Excessive Correction Amount Detection Function
This function detects cases where the amount of current position correction executed by the “current position
preset” function exceeds the “permissible correction amount” designated by parameter No.66.
(5) Upper Limit Violation detection Function
This function detects cases where the current position value exceeds the upper limit setting designated by
parameter No.61.
(6) Lower Limit Violation Detection Function
This function detects cases where the current position value is below the lower limit setting designated by
parameter No.62.
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