
1.AXIS CONTROL B-63943EN-1/02
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1.4.4 FSSB Setting
Overview
Connecting the CNC control section to servo amplifiers via a
high-speed serial bus (FANUC Serial Servo Bus, or FSSB), which
uses only one fiber optics cable, can significantly reduce the amount
of cabling in machine tool electrical sections.
In a system using the FSSB, it is necessary to set up the following
parameters to specify its axes.
• No.1023
• No.1905
• No.1936 to 1939
• No. 14340 to 14375, 14376 to 14407 (when an additional axis
board is used, parameters Nos. 14408 to 14425 and 14444 to
14459 are added.
Any description below of parameters Nos. 14340 to 14375 and
14376 to 14407 is assumed to include parameters Nos. 14408 to
14425 and 14444 to 14459 when an additional axis board is used,
and description of parameters Nos. 14408 to 14425 and 14444 to
14459 is omitted.)
These parameters can be specified using the following methods:
1. Manual setting 1
Parameters are defaulted according to the setting of parameter No.
1023. There is no need to specify parameter Nos. 1905, 1936 to
1939, 14340 to 14375, and 14376 to 14407. No automatic setting
is used. Note that some functions are unusable.
2. Automatic setting
Axis settings are calculated automatically according to the
interrelationships between axes and amplifiers entered on the
FSSB setting screen. Parameter Nos. 1023, 1905, 14340 to 14375,
14376 to 14407, and 1936 to 1939 are specified automatically
according to the results of the calculation.
3. Manual setting 2
Parameter Nos. 1023, 1905, 1936 to 1939, 14340 to 14375, and
14376 to 14407 are specified according to manually entered
values. The user must be totally familiar with the meaning of
each parameter before entering any values.
Explanation
- Slave
In an FSSB-based system, a fiber optics cable is used to connect the
CNC to servo amplifiers and separate detector interface units. These
amplifiers and separate detector interface units are called slaves. The
two-axis amplifier consists of two slaves, and the three-axis amplifier
consists of three slaves. Slave numbers 1 to 18 are sequentially
assigned to slaves for each FSSB line. Number 1 is assigned to the
slave nearest to the CNC.