Siemens SINUMERIK 840C - Manual (Page 25)

06.93 1 Prerequisites and Visual Inspection
1.2.10 Jumpering
1.2.10 Jumpering
The jumper configurations on the modules required at the time of installation and start-up is
discussed in Part 2 of the Interface Description.
1.2.11 Position control, input and measuring system resolution
In SINUMERIK, position control resolution and input resolution can be entered separately. In
order to maintain a closed position control loop, however, it is necessary to coordinate the
pulses from the digital measuring system with the control's precision capability.
The "unit (MS)" is used as unit of measurement for the position control resolution, the "unit
(IS)" as unit of measurement for the input resolution.
The following applies:
1 unit (MS) = 2 units of position control resolution
1 unit (IS) = 1 unit of input resolution
Example:
If the position control resolution is 0.0005 mm and the input resolution is 0.001 mm, then
1 unit (IS) = 1 unit (MS) = 1 µ m
Refer to NC MD 5002, NC MD 1800*, NC MD 524* for details on input, position control and
display resolution.
1.2.12 Input units
Unit (MS) = 2 units of position control resolution (reference system MS)
e.g. 1 unit of position control resolution = 1/2 µ m (MD 1800* = xxxx0100)
x..is irrelevant here
1 unit (MS) = 1 µ m
Unit (IS) = 1 unit of input resolution (reference system IS)
e.g. 1 unit of input resolution = 1 µ m (MD 5002 = 0100xxxx)
1 unit (IS) = 1 µ m
VELO ...smallest unit used by the digital-analog converter (DAC) for setpoint conversion
10
In the case of a 14 bit DAC: 1 VELO = ––––––– = 1.22 mV
8192
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 1–5
SINUMERIK 840C (IA)