In order to provide the user with even simpler access to these control values and setpoints, the
MOVITRAC
®
31.. frequency inverter offers a direct insight into process data received via the fieldbus
system, using the fieldbus monitor parameters
P074 PO1 setpoint (hex)
P076 PO2 setpoint (hex)
P078 PO3 setpoint (hex)
(Fig. 29). Process output data received from the inverter are passed via the serial interface to the
hand-held keypad or to the
MC_SHELL PC program. Despite the loss of data because of the varying
transmission speeds, this method of diagnosis has been shown in practice to be of assistance.
These fieldbus monitor parameters allow all process output data to be checked in hexadecimal form
using the inverter’s hand-held keypad. In addition, the
MC_SHELL PC program offers an interpretation
of the process output data conforming to the unit profile, such as a display of speed setpoints in units
of [1/min].
6.2
Diagnosis of Process Input Data
As is the case with diagnosis of process output data, the fieldbus monitor parameters
P075 PI1 actual value (hex)
P077 PI2 actual value (hex)
P079 PI3 actual value (hex)
can be used to access the status information or the actual values sent from the inverter to the
higher-level control (Fig. 30).
MO
V
IT
R
A
C
®
841
E
Q
RUN
BUS
FAULT
Feldbus
STEUERMODE
Fieldbus
CONTROL MODE
0006hex
0006hex
01F4hex
01F4hex
0000hex
0000hex
PO3
PO2
PO1
Process output data (PO)
078 PO3 setpoint (hex)
076 PO2 setpoint (hex)
074 PO1 setpoint (hex)
00336AEN
Fig. 29: Process output data diagnosis with MOVITRAC
®
31..
MO
V
IT
R
A
C
®
841
E
Q
RUN
BUS
FAULT
Feldbus
STEUERMODE
Fieldbus
CONTROL MODE
0007hex
0007hex
01F3hex
01F3hex
0000hex
0000hex
PI3
PI2
PI1
Process input data (PI)
079 PI3 act. value (hex)
077 PI2 act. value (hex)
075 PI1 act. value (hex)
00337AEN
Fig. 30: Process input data diagnosis with MOVITRAC
®
31..
Commissioning and
Diagnosis
6
54
MOVITRAC
®
31.. Fieldbus Unit Profile
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