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4.9
Data formats and data conversion
Data format
Mitsubishi converters handle data as unsigned 16 bit integer. The
Mitsubishi
direction of rotation is coded in control bits STF (RYn0) and STR
converter
(RYn1). Depending on the process value (e.g. current, frequency) this
integer value gets a precision factor:
Table 4-8
Data format
SIMOVERT MASTERDRIVES works internally with process values in
SIMOVERT
16 bit or 32 bit signed integer (2nd-complement). These values are
MASTERDRIVES
normalized in percent:
16 bit
4000h
0000h
C000h
Table 4-9
The display of SIMOVERT MASTERDRIVES shows the absolute value.
For this reason there are parameters with scaling factors (e.g.
P350...P353). Their contents are the absolute value at + 100 %.
CBL has to convert the data from Mitsubishi data format in
MASTERDRIVES data format and vice versa. The CBL uses
parameters (P715...P718) pointing to the scaling parameters
(P350...P353). Other scaling factors may be parameterized. Normally
the user sets P715 = 350, P716 = 351, etc. In this way CBL use the
same scaling factors like display routines of the converter. CBL
automatically adapts the precision between Mitsubishi data format and
MASTERDRIVES display format. It uses the parameter description
(conversion index in IEEE format) of the scaling factor parameters.
4-22
Process
Precision integer
value
(1 digit)
Frequency
0.01 Hz
Current
0.01 A
Voltage
0.1 V
Torque
0.1 %
Rotation
1 Rotation/minute
Mitsubishi data format; precision
Integer value
32 bit
Real value
.
.
.
.
4000.0000h
.
.
.
.
0000.0000h
.
.
.
.
C000.0000h
.
.
.
.
SIMOVERT MASTERDRIVES internal data format
Operating Instructions
.
.
+ 100 %
.
.
0 %
.
.
– 100 %
.
.
6SE7087-6NX84-0GB0
SIMOVERT MASTERDRIVES
03.99
Siemens AG
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