FAQ: When using an MP920's SVA Servo interface and an absolute encoder on a Sigma II Servopack (SGDH), how is the absolute data requested and confirmed complete in the application program?
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For the case of axis 1: In order to initiate the read OBC000A (Absolute position read request) must transition from OFF (0) to ON (1.) The confirmation flag that the read is complete is IBC000A (Absolute read complete signal) will transition from OFF (0) to ON (1.) If there is a problem with the absolute read, then IBC0004 (Cumulative number of rotations error) will transition from OFF (0) to ON (1.)
The OBC000A (Absolute position read request) should not be ON (1) in the "setting parameters." This bit will initiate the absolute encoder read, and is dedicated for the application program. If the Servopack loses control power but the MP920 does not, then the OBC000A (Absolute position read request) bit will have to be toggled OFF then ON again for a re-read of the encoder's absolute position. The application program can test if the Servopack's Control is ON by monitoring the state of the "Broken PG Wire" bit; IBC00232.
Please reference section 5.7 in the "Sigma II Series Servo Manual" (YEA-SIA-S800-32.2) for details on how the absolute encoder data transfer works.
For more details on SVA servo interface please reference section 5.4 in "Machine Controller MP920 User's Manual Motion Module" (SIEZ-C887-2.5.)
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