User`s manual

10 - 5
10
[4] Reading absolute values
On this system, the absolute value is automatically read to the driver from this module when the
module is powered ON. At this time, a retry is performed for five seconds until reading is completed
in consideration of the driver's startup time. If data is not returned from the driver during these five
seconds, an absolute driver communications error (error code 016) occurs.
The instruction present value is rewritten to the absolute present value by turning the absolute
present value read relay (n+02027 in the case of the X-axis) ON even during communications.
Data read timing at power ON and when the absolute present value read relay turns ON in an
X-axis absolute system
Power supply
Absolute present value
read relay (
n+02027)
Driver communications
completed (X)
(n+00012)
Present value
(N+0004 to 0007)
Absolute value is read by
communications.
Instruction system present value. Present value is overwritten to absolute value. Present value is overwritten to absolute value.
Absolute value is read by
communications.
Absolute present value is automatically read at power ON.
(Note) This module sometimes outputs several pulses when the module is powered OFF. Accordingly,
a deviation of several pulses is sometimes generated before and after a power OFF. However,
absolute present positions held by the encoder do not deviate.