Siemens SINUMERIK 880 SW 6 Planning Manual page 255

8 Spindle/PLC Interface (DB 31)
8.1 Introduction
Structure of spindle control
Encoder
Spindle 1
NC
Spindle
channel
number
1
DB 10, DL 3
S value
Intermediate memory
S value
PLC SPINDLE CONTROL
S value
PLC SPINDLE CONTROL
(D 2.0)
BASIC SPEED (D 2.5)
OSCILLATION SPEED (D 2.6)
All data words
in DB 31
Spindle control structure
The above figure shows the basic structure of the spindle control on the SINUMERIK 880.
The pulses of all the spindles can be read by each NC channel. Which channel interprets
which spindle pulses is determined by means of the channel-specific SPINDLE NUMBER sign-
al. It is permissible for several channels to access the same spindle pulses at the same time.
This means, for instance, that on double slide lathes control can pass from channel 1 to, say,
channel 2 at v = const. without switching over hardware (also see following figure).
The spindle-specific CHANNEL NUMBER signal is used to determine from which channel the
spindle obtains set speed values (S word). If, for example, control passes from channel 1 to
channel 2 (at v = const.) on a double slide lathe, the spindle-specific CHANNEL NUMBER in-
terface signal must change from 1 to 2.
–
8 2
Spindle 6
Channel number (DL 2)
NC
NC MD 449*
NC
Basic speed
Acceleration time constants
(NC MD 419* ... 426*)
Set speed value
CONTROLLER ENABLE
(D 1.14)
©
Siemens AG 1991 All Rights Reserved
NC
Spindle
channel
number
16
DB 25, DL 3
S value
NC MD 450*
Oscillation speed
6ZB5 410-0HE02
SINUMERIK 880 (PJ)
05.91