Installation manual
CNC 8060
CNC 8065
MACHINE PARAMETERS.
2.
(REF: 1402)
·57·
General machine parameters.
PRGFREQ
Frequency of the PLC's PRG module.
Possible values: from 1 to 100 cycles.
Default value: 2 cycles.
Associated variable: (V.)MPG.PRGFREQ
This parameter indicates how often (every how many CNC cycles) a full cycle of the PLC
program is executed. This parameter also sets the refreshing frequency of the digital inputs
and outputs as well as analog inputs.
Thus, with a sampling period LOOPTIME = 4 ms of and a frequency of PRGFREQ = 2, the
PLC program will be executed every 4 x 2 = 8 ms.
SERCOS BUS CONFIGURATION
SERBRATE
Sercos transmission rate.
Possible values: 2/4/8/16 Mbps (megabits per second).
Default value: 4 Mbps.
Associated variable: (V.)MPG.SERBRATE
This parameter indicates the Sercos transmission speed used when communicating with the
drives and RCS-S modules (Sercos counter). All elements of the Sercos ring must have the
same value.
Speeds of 8 Mbps and 16 Mbps require a Sercos board that can work at these speeds;
otherwise the speed will be limited to 2 Mbps and 4 Mbps.
SERPOWSE
Sercos optical power.
Possible values: From 1 to 6 ("Sercos I" board) / from 1 to 8 ("Sercos II" board).
Default value: 4 ("Sercos I" board) / 2 ("Sercos II" board).
Associated variable: (V.)MPG.SERPOWSE
This parameter sets the Sercos power or the intensity of the light going through the optic fiber.
The optical power value depends on the total length of the cable being used. Set this
parameter with the same value used by the drives.
Use the following approximate values. Assigning other values, e.g. a value of 6 for a length
of 3 m, can cause communication errors due to fiber optic signal distortion.
Recommended values ("Sercos I" board).
Recommended values ("Sercos II" board).
Sercos communication at 8 and 16 MHz requires a drive version V6.05 or higher.
SERPOWSE Cable length.
2 Less than 7 meters.
4 From 7 to 15 meters.
6 More than 15 meters.
SERPOWSE Cable length. Recommended cable type.
1 to 4 Less than 15 meters. SFO / SFO-FLEX
5 to 6 From 15 to 30 meters. SFO-FLEX
7 From 30 to 40 meters. SFO-FLEX
8 More than 40 meters. SFO-V-FLEX
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