09.95
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SINUMERIK 840C (IA)
9.4 Mixed I/O configuration and digital-analog converter, DAC (as
from SW 3)
General notes on The possible applications for digital-analog converters described in this Section
mixed I/O are used to conduct test measurements on digital signals from the drive or posi-
tion control. These signals can be output as analog voltages for diagnostic purpo-
ses on an oscilloscope or a recorder.
The 4 DAC channels of the MIXED I/O module with the order no.
6FX1138–4BA01 (16-bit resolution) are used for this purpose.
The DAC signals are output at connector X111.
General notes Max. 4 DAC channels are supported for output of SERVO quantities.
on DAC, 611D drives
The DACs on the 611D feed and main spindle drives have the following features:
SW 3:
S8-bit resolution
S3 DACs on each feed drive module (single and two-axis module).
SEach main spindle module is provided with 2 DACs and a special-purpose
test socket. This test socket outputs a voltage which is proportional to the cur-
rent actual value of phase R (see Table).
Module Scaling
Test socket IR
8/10/16 A 25 A 8.25 V
24/32/32 A 50 A 8.25 V
30/40/51 A 75 A 8.25 V
45/60/76 A 150 A 8.25 V
60/80/102 A 150 A 8.25 V
85/110/127 A 200 A 8.25 V
SW 4/SW 5:
S8-bit resolution
S3 DACs are installed on each MSD and FDD module
Arrangement of DACs/sockets:
X1: Test socket DAC1
X2: Test socket DAC2
X2X1 X3 : Test socket DAC3
X3/IRMIR: Test socket current actual value phase R
(MSD module) – SW 3 only

X3/IRMM: Reference earth for test sockets

With SW 3 only, the scaling of the voltage output with test socket IR is dependent
on the MSD module used:
9 Drive Servo Start-Up Application (as from SW 3)
9.4 Mixed I/O configuration and digital-analog converter, DAC (as from SW 3)