Fagor CNC 8060 - Page 163

Installation manual
CNC 8060
CNC 8065
MACHINE PARAMETERS.
2.
(REF: 1402)
·163·
Machine parameters for the axes. Work sets.
corresponds to the SSI transmission sequence. If start bits have been programmed, the CNC
assumes that they will be received first.
SSICRCTYPE
CRC type.
Possible values: Do not calculate CRC / Fagor Checksum / INDUCTOSYN Checksum.
Default value: Do not calculate CRC
Associated variable: (V.)[ch].MPA.SSICRCTYPE[set].xn
When the encoder transmits extra data besides the position data, this parameter sets the
type of calculation to do to check data coherence. This parameter only makes sense when
SSICRCBITS is other than 0.
SSICRCBITS
Number of CRC bits of the SSI transmission to check that the
transmission is valid.
Possible values: From 0 to 31.
Default value: 0.
Associated variable: (V.)[ch].MPA.SSICRCBITS[set].xn
Number of bits, if any, for the transmission validity check (CRC, checksum, parity).
SSISTARTBITS
Number of start bits.
Possible values: From 0 to 3.
Default value: 0.
Associated variable: (V.)[ch].MPA.SSISTARTBITS[set].xn
Number of bits, if any, to wait for before receiving position data.
SSIALARMBITS
Number of alarm bits
Possible values: From 0 to 2.
Default value: 0.
Associated variable: (V.)[ch].MPA.SSIALARMBITS[set].xn
The feedback device can send one or more bits indicating an alarm condition if something
goes wrong or one or more acknowledgment bits if the transmission is successful.
SSIALARMLEVEL
Level of the alarm bits to issue an error.
Possible values: From 0 to 3.
Example:
SSICRCBITS = 5
SSIALARMBITS = 1
SSIDATABITS = 23
SSIPACKFORMAT = Alarm - Data - CRC
The CNC expects the SSI transmission to be a sequence of bits where the first one is the alarm bit
followed by 23 position bits or data bits and finally the 5 CNC bits.
Value. Meaning.
Do not calculate CRC. Even if the CNC receives the CRC bits, they are not processed at
all and, therefore, no errors are reported when the transmission is
not correct. It is not a recommendable option and it must only be used
during setup.
Fagor checksum. Data checking algorithm used in Fagor Automation feedback
systems.
INDUCTOSYN checksum. Data checking al gor ithm us ed when connecting to an
INDUCTOSYN module.
For example, Fagor absolute linear encoders may be configured to transmit 5 CNC bits together with
the position value. If a linear encoder is configured in this mode, program SSIDATALENGTH=27 and
SSICRCBITS =5.