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Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
9
Diagnostics of process input and output data
Bus Diagnostics
9.2
Diagnostics of process input and output data
After having set the communication parameters, you should check the process data
which are sent from and to the controller. Ensure the correct sequence of bytes
("Motorola" or "Intel"), uniform number format (decimal or hexadecimal), and uniform
method of counting the bits in a byte or word (bits 0 - 7 or bits 1 - 8). Convenient fieldbus
master connections offer simple diagnostic options, such as LED panels on the front
cover that let you diagnose the individual process data of the fieldbus.
Fieldbus monitor
parameters
For simple access to these control and setpoints values, the MOVIDRIVE
®
inverter
offers the fieldbus monitor parameters for direct access to the process data received and
sent by the fieldbus system (see figure below).
• P094 PO1 setpoint (hex)
• P096 PO2 setpoint (hex)
• P098 PO3 setpoint (hex)
• P095 PI1 actual value (hex)
• P097 PI2 actual value (hex)
• P099 PI3 actual value (hex)
For this purpose, MOVITOOLS
®
MotionStudio reads the process data sent from and
received by the drive inverter. Not all process data cycles are displayed due to different
transmission speeds. Checking the displayed values will usually let you quickly find the
cause of the fault.
Fieldbus monitor
The fieldbus monitor parameters let you control all process data in hexadecimal form
using the keypad of the inverter. The fieldbus monitor (see chapter "MOVITOOLS
®
MotionStudio Engineering Diagnostic Software") of the MOVITOOLS
®
MotionStudio
engineering programm even offers profile-compliant interpretation of the process data,
such as the display of speed setpoints in rpm.
Unit-internal
scope
For diagnosing cyclically transmitted process data, you can record input and output
values over an extended period of time using the unit-internal scope and have these
values displayed in MOVITOOLS
®
MotionStudio. In this way even faulty setpoints can
be detected that only occur rarely. For more information on unit-internal scope, refer to
the online help of MOVITOOLS
®
MotionStudio.
54676AEN
Px3
Px2
Px1
Process input/output data
P09x Px1 setpoint (hex)
P09x Px2 setpoint (hex)
P09x Px3 setpoint (hex)
0006
hex
014F
hex
0000
hex
0006
hex
01F4
hex
0000
hex
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