Parameterization and Operation
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4.5.12
Diagnostic Messages and Alarms
The MIO device features several diagnostic options.
If a fault occurs, the transducer block sets a block alarm. The block alarm is a combined error
signal for all fault signals and remains set, as long as a fault in the block exists. For detailed
information of the alarm cause after a block alarm, the MIO device provides the following
parameters:
■
Block Err.
■
XD Error
■
Valve Lead Fault
■
Sensor Lead Fault
■
Valve Warning
■
Valve Error
■
Valve Info
If the control system in use supports alarm messages via the FOUNDATION Fieldbus, setting
and resetting of the block alarm is transferred via the bus to the control system. As this function
is currently not supported by all control systems, the MIO device offers an alternative option to
issue faults:
As soon as the transducer block recognizes a fault, a message is set in Block Err. parameter of
the connected DO function block. Normally, this parameter is read out and evaluated in cycles
by control systems which do not support alarm messages via FOUNDATION Fieldbus.
If the fault is related to the valve control (e. g., lead breakage of valve feeding lead or exceeding
the admitted valve transit time), the message "Output failure" is set. If the final position
feedback contact fails (e. g., lead short circuit of the lead that feeds the final position feedback
contact), the message is "Input failure".
All messages, except a configuration error, are transferred this way. Therefore, check after each
modification of parameterization of the MIO device that this message is not set in the Block Err.
parameter. If the control system used does not support alarm messages via FOUNDATION
Fieldbus, in the Features Sel. resource block parameter, deactivate the option "Reports".
4.6
Parameterization in Binary Input Mode
The binary mode supports up to 12 discrete inputs, organized in the following 2 groups:
■
Group 1: Hardware channels 1, 4, 7, 10
■
Group 2: Hardware channels 2, 3, 5, 6, 11, 12
The device samples the inputs in 2 independent cycles. Group 1 hardware channels 1, 4, 7, 10
are intended to be used for sensing multiplexed binary inputs as vibration forks, NAMUR
sensors, or mechanical switches. The ON-time of group 1 channels can be adjusted
individually in a range between 10 ms ... 11 000 ms. The total cycle time is the sum of the
4 individual ON-times.
Group 2 hardware channels 2, 3, 5, 6, 11, 12 are intended to be used for sensing multiplexed
binary inputs as NAMUR sensors and mechanical switches. The sampling time is fixed to
10 ms and is not adjustable. The total cycle time is the product of the number of channels used
x 10 ms. The minimum total cycle time is 50 ms. If all 8 sensors are used, the total cycle time is
80 ms.
More Information
For more information on diagnostic options and troubleshooting, see chapter 5.
For a detailed list of the messages of the tranduceer block parameters and for
troubleshooting, see chapter 5.4.
