2
0
1
8
-0
7
54
Channel-Related Parameters for the Valve Coupler Modes
8.4
Diagnostic Parameters
This section describes the channel-related diagnostic parameters.
8.4.1
Wire Check
You can activate or deactivate the monitoring of wire faults. The following parameters exist:
For all parameters, bit 0 enables/disables the lead short circuit monitoring and bit 1
enables/disables the lead breakage monitoring:
0 = disabled
1 = enabled
8.4.2
Stroke Counter
The MIO can monitor the number of strokes of a valve. A stroke starts in the valve status "open"
and continues with a closing and opening procedure. The stroke counter thus increases by 1,
after the valve is closed and opened again.
The number of strokes can be compared with a freely adjustable limit value. If this limit value is
exceeded a message is issued. To activate the stroke monitoring process, change the Valve
Monitor parameter to either of the following values: "stroke counter" or "time monitor and stroke
counter".
In addition, activate monitoring of the valve setting times for "time monitor and stroke counter".
For more information, see chapter 8.4.3 and in the DTM, see chapter 8.4.3. The current counter
reading is included in the Stroke Counter parameter. You can also change this parameter to a
specified value if the valve, e. g., was in operation before.
Enter the limit value in the Limit Stroke Counter parameter. When this limit value is exceeded,
the message "limit stroke counter exceeded" is issued. For bit 16 in CB_D, see chapter 4.3.1.
If you set the Sensor Usage parameter to "no position check", the stroke counter monitoring is
not activated. For more information, see chapter 8.3.2 and in the DTM "Sensor usage", see
chapter 10.4.6.
8.4.3
Time Monitoring
The MIO device can monitor the breakaway and transit times of a valve. The Valve Monitor
parameter is either set to "time monitor" or "time monitor and stroke counter". In addition, you
can activate the stroke counter for "time monitor and stroke counter". For more information, see
chapter 8.4.2 and in the DTM, see chapter 10.4.7.
Define a reference value and a tolerance value for the breakaway and transit times.
The tolerance value is used to avoid fault messages due to normal variations of the process
and ambient conditions.
The breakaway and transit times are monitored during the opening and closing process.
Parameter
Description
VALVE_WIRE_CHECK
Enables/disables the lead short circuit and lead breakage
monitoring of the valve connection for the hardware channels
1, 4, 7, 10 (transducer-block-specific)
SENSOR_A_WIRE_CHECK
Enables/disables the lead short circuit and lead breakage
monitoring of the position feedback sensor A connection for
the hardware channels 2, 5, 8, 11 (transducer-block-specific)
SENSOR_B_WIRE_CHECK
Enables/disables the lead short circuit and lead breakage
monitoring of the position feedback sensor B connection for
the hardware channels 3, 6, 9, 12 (transducer-block-specific)
