108
Operating Instructions – MOVITRAC® B
5
Communication and unit profile
Startup
Read Scale
This service can be used to determine the scaling of a parameter. The inverter provides
a so-called measurement index and a conversion index.
Quantity index:
The quantity index is used for coding physical values. This index provides a communi-
cation partner with information about which physical quantity is involved with the corre-
sponding parameter value. The values are coded according to the sensor/actuator pro-
file of the PROFIBUS user organization (PNO). The entry FF
hex
means that no mea-
surement index is specified. You can also gather the measurement index from the pa-
rameter list of the inverter.
Conversion index:
The conversion index is used for converting the transmitted parameter value into a basic
SI unit. The values are coded according to the sensor/actuator profile of the PROFIBUS
user organization (PNO).
Example:
Drive parameter:
P131 ramp t11 down CW
Measurement index:
4 (= time with second as measurement unit)
Conversion index:
3 (10
-3
= milli)
Transmitted numerical value: 3000dec
The frequency inverter interprets the numerical value received via bus as follows:
3000 s × 10
-3
= 3 s
Read attribute
This service can be used for reading the access attributes and the index of the next pa-
rameter. The following table shows the coding of the data for this parameter service.
The coding of the access attributes is unit-specific. For MOVITRAC
®
B inverters, the at-
tribute definition results from the following table:
Byte 4
Byte 5
Byte 6
Byte 7
MSB data
Data
LSB
LSB data
Reserved
Quantity index
Conversion index
Byte 4
Byte 5
Byte 6
Byte 7
MSB data
Data
LSB
LSB data
Next available index
Access attributes
Byte 6
Byte 7
Bit
Bit
Meaning
0
1 = Parameter allows write access
1
1 = Parameter is permanently saved on EEPROM
2
1 = Factory setting overwrites RAM value
3
1 = Factory setting overwrites EEPROM value
4
1 = EEPROM value is valid after initialization
5
1 = Controller inhibit condition not necessary for write access
6
1 = Password required
8
7
00 = Parameter is generally valid
01 = Parameter is assigned to parameter set 1
10 = Parameter is assigned to parameter set 2
11 = Parameter is assigned to both parameter sets
9 - 15
Reserved
00
I
Summary of Contents for Movitrac B
Page 2: ...SEW EURODRIVE Driving the world...
Page 259: ......
