Types

ABB Field Information Manager Learning Center

Depending on the characteristics of the respective node, one of the following Loop Check Types is used.

Note:
Automated Loop Check is supported for HART and PROFIBUS PA devices.
Other nodes of I/O devices (e.g. used for digital switches) support a manual documentation dialog.

Note:
For automatic Loop Check Types, the default maximum waiting time per test point is 16.5 seconds. This is compatible with typical field devchice reaction times and cycle times within the system application.

In case of very slow field device reaction times or long cycle times of more than 2000 ms within the system application, Field Information Manager might not be able to get the latest values from the system. In such case, the maximum waiting time can be configured in the following file: "C:\Program Files (x86)\Common Files\ABB\Field Information Manager\ABB.DM.Application.exe.config".

The configuration file can be opened with any text editor, but administrator rights are required for saving changes. At the beginning of the configuration file, there is a section providing instructions and allowed values for this setting.

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Automatic Loop Check

Automatic Loop Check is only applicable for nodes with Signal Type "AI" and connected field device.

The Loop Check is performed automatically without any required user interaction, including all test points for the configured test groups.

At the beginning of the test, the connected field device is put into simulation mode. 

For each of the test points, the field device is forced to the expected value and the measured value is read back from the input channel in the system to which field device is connected to. The measured value from the system is checked against the expected value automatically, leading to a result for the respective test point.

Device configuration (LRV, URV and Unit) is used for scaling of expected values while node configuration (LRV, URV and Unit) from the system is used for scaling of measured values.

At the end of the test, the connected field device returns to normal operation mode.

Automatic Loop Check with Authorization

Automatic Loop Check with Authorization is only applicable for channels with Signal Type "AO" and connected field device.

The Loop Check of such channels (and the connected field devices) can cause moving parts within the system, therefore the user has to enter his credentials before each execution in order to authorize it.

After successful authorization, the Loop Check is performed automatically without any further required user interaction, including all test points for the configured test groups.

At the beginning of the test, the channel is put into forced mode.

For each of the test points, the output channel in the system to which the field device is connected to is forced to the expected value. This causes the connected field device to move accordingly to the given output value. The field device's position feedback is provided on Device Variable 1 of the channel in the system. The measured value (i.e. the position feedback) is checked against the expected value automatically, leading to a result for the respective test point.

 Device configuration (LRV, URV and Unit) is used for scaling of expected values while channel configuration (LRV, URV and Unit) from the system is used for scaling of measured values.

At the end of the test, the channel returns to normal operation mode.

Note:
The Device Variable 1 to receive the field device's position feedback automatically is only available for Select I/O. For Loop Check of output channels of other Remote I/O systems (e.g. S800 I/O and
S900 I/O), please refer to Loop Check Type "Semi-Automatic Loop Check with Authorization".

Semi-Automatic Loop Check with Authorization

Semi-Automatic Loop Check with Authorization is only applicable for nodes with Signal Type "AO" and connected field device and represents an alternative to Automatic with Authorization.

The Loop Check of such nodes (and the connected field devices) can cause moving parts within the system, therefore the user has to enter his credentials before each execution in order to authorize it.

After successful authorization, the Loop Check is performed step by step, including all test points for the configured test groups.

At the beginning of the test, the channel is put into forced mode. 

For each of the test points, the user has to check the measured value manually against the expected value and enter a result for the respective test point.

Device configuration (LRV, URV and Unit) is used for scaling of expected values.

At the end of the test, the node returns to normal operation mode.

Manual Loop Check

Manual Loop Check is applicable for nodes without a connected field device.

The Loop Check is performed manually with a documentation dialog, in which the user can enter a result and a remark in text form.

Loop Check

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