Siemens sinumerik 840D sl Function Manual page 575

Detailed description
2.4 Setpoint
Machine data for configuring the analog module
The following system machine data is relevant in ensuring correct output of the speed
setpoint via the analog module:
• MD10364 $MN_HW_ASSIGN_ANA_FASTOUT (for each analog module)
• MD10384 $MN_HW_CLOCKED_MODULE_MASK (for each terminal block)
• MD10380 $MN_HW_UPDATE_RATE_FASTIO (for each terminal block)
2.4 Setpoint
Setpoint in hardware
The speed setpoint of an analog axis is written to a digital-to-analog converter in every
position controller cycle and is available there as a signal in the +/- 10 V range.
A digital-to-analog converter is required for each analog axis. It is inserted in the NCU
terminal block as a DMP output module. A maximum of 8 DMP modules can be inserted in
an NCU terminal block.
The setpoint is taken to the analog drive amplifier (e.g. SIMODRIVE 611A) which controls
the motor.
Servo enable
Other signals such as servo enable or NC Ready required by the analog drive amplifier are
not applied at the NCU terminal block, but must be derived from the SIMATIC I/O devices.
Configure setpoint
Analog axes do not transfer an internal setpoint to a digital drive. For this reason, they must
be configured as simulated axes with respect to setpoints. Machine data 30100 to 30130 are
used for this purpose.
MD30100 $MA_CTRLOUT_SEGMENT_NR = 1: Bus segment 840D
MD30110 $MA_CTRLOUT_MODULE_NR =: The module number of an unassigned module
must be entered here even through the setpoint output is simulated. This module need not
actually exist in the hardware.
MD30120 $MA_CTRLOUT_NR = 1: Always 1 for 840D
MD30130 $MA_CTRLOUT_TYPE = 0: Simulated setpoint
10
The analog module is activated on specification of its physical address.
The slot in which the analog output module is slotted into on the terminal block must be
set to isochronous mode.
This is carried out by setting the bit which corresponds to the module slot on the terminal
block (e.g. 5th slot: 10 Hex)
Selecting the cycle clock to which the digital-to-analog converter will be synchronized
2 = Position controller cycle clock for the analog axis.
Special functions: Analog Axis (TE2)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0