12. ABSOLUTE POSITION DETECTION SYSTEM
12 - 25
(2)Transfer method
The following shows a sequence how to turn on the base circuit while it is off state because SON is off,
EM2 is off, or an alarm is occurring. In the absolute position detection system, always give the serial
communication command to read the current position in the driver to the PC or PLC...etc every time RD
turns on. The driver sends the current position to the PC or PLC...etc on receipt of the command. At the
same time, this data is set as a position command value in the driver.
(a) Sequence processing at power-on
1) The base circuit turns on after 95 ms.
2) After the base circuit is turned on, RD turns on.
3) After RD turned on and the PC or PLC...etc acquired the absolute position data, give command
pulses to the driver. If the PC or PLC...etc gives command pulses before acquiring the absolute
position data, a position shift can occur.
(b) Communication error
If a communication error occurs between the PC or PLC...etc and driver, the driver sends the error
code. The definition of the error code is the same as that of the communication function.
Refer to section 14.3.3 for details.
If a communication error has occurred, perform retry operation. If several retries do not result in a
normal termination, perform error processing.
To Next Page
Loading...
Need help?
General