Baumer GNAMG - Manual (Page 14)

Manual_GNAMG_Profibus_EN.doc 14/19 Baumer IVO GmbH & Co. KG
04.05.11 Villingen-Schwenningen, Germany
6.6. Preset function
The control can transmit a preset value to the inclination sensor, thus setting the inclination sensor at the
predetermined mechanical position to a defined position value. The preset must be within the programmed
total sensing range depending on the selected resolution.
For optimum alignment of mechanical position and preset value, it is recommended to set the preset only
when the inclination sensor is idle.
For setting the preset, the preset value is transmitted twice to the inclination sensor by the control: First
with set most significant bit (MSB), second again with reset MSB. So to say, the MSB serves as „Clock“
bit. The first transmission is relevant for the time of adoption.
The set preset value must be within the limits of the parameterized resolution listed in the table below:
Sensor
Resolution Minimum limit Maximum limit
30° 0.001° -30000 +30000
0.01° -3000 +3000
0.1° -300 +300
1.0° -30 +30
The corresponding two command sequences for the preset:
At the 360° sensor the X-axis must be write only!
Axis
With set MSB With reset MSB
X -axis 10000101 (0x85) 00000101 (0x05)
Y-axis 10000110 (0x86) 00000110 (0X06)
Example: Reset of the inclination sensor X-axis (Preset value = 0)
Step
1: (Command byte)
Output byte 10 Output byte 11 Output byte 12 Output byte 13 Output byte 14
00000000 (0x00) 00000000 (0x00) 00000000 (0x00) 00000000 (0x00) 10000101 (0x85)
Step 2:
00000000 (0x00) 00000000 (0x00) 00000000 (0x00) 00000000 (0x00) 00000101 (0x05)
6.7. Offset function (not possible for the 360° sensor)
Utilizing the difference between actual position value and preset value the inclination sensor calculates for
internal purposes a so-called offset value that normally is not relevant for the application. However, it is
also possible to define a specific offset value that is added to the actual inclination value of the axis.
The procedure is the same as for setting the preset, and also the offset limits must be selected according
to the parameterized resolution.
Sensor
Resolution Minimum limit Maximum limit
30° 0.001° -30000 +30000
0.01° -3000 +3000
0.1° -300 +300
1.0° -30 +30
Both command sequences for the offset:
Axis With set MSB With reset MSB
X-axis 10010001 (0x91) 00010001 (0x11)
Y-axis 10010010 (0x92) 00010010 (0X12)