Values of I/O tags
An object of the I/O tag type may acquire values in the system, which are described for individual types in the following tables for individual types (only the types, listed below, are described in the tables).
- Ai - Analog input
- Ao - Analog output
- Ci - Cardinal input
- Co - Cardinal output
- Di - Logical input
- Dout - Logical output
- TxtI - Text input
- TxtO - Text output
- TiA - Absolute time - input
- ToA - Absolute time - output
- TiR - Time interval - input
- ToR - Time interval - output
- Qi - Quaternary input
I/O tags of
Di type
- Logical input| Object value | Cause |
|---|
| D_False | *FALSE value |
| D_True | *TRUE value |
| D_Oscillate | Oscillating value (TRUE <-> FALSE). The system sets a value as |
the one *Valid for the normal polarity. In case of the inverse polarity, then opposite values are valid.
I/O tags of
Dout type
- Logical output| Object value | Cause |
|---|
| D_False | *FALSE value |
| D_True | *TRUE value |
| D_Oscillate | Oscillating value (TRUE <-> FALSE). The system sets a value as |
the one *Valid for the normal polarity. In case of the inverse polarity, then opposite values are valid.
...
I/O tags of
Qi type -
Quaternary inputQuaternary inputs are used e.g. in electricity industrypower engineering. Example of use: opening a pulp valve with logical sensors of the end positions closed and open - can contain be in the following states:
- the value of the sensor open is True, the value of the sensor closed is False, the value of the quaternary input is open - On
- the value of the sensor open is False, the value of the sensor closed is True, the value of the quaternary input is closed - Off
- the values of both sensors are False (the pump valve is between end positions), the value of the quaternary input is transition - Trans
- the values of both sensors is True (it can be caused by e.g. a communication error or physical sensor damage), the value of the quaternary input is error - Err
| Object value | Cause |
|---|
| Q_Off | OFF value |
| Q_On | ON value |
| Q_Trans | TRANS value (transition from ON |
- change | or vice versa is in progress) |
| Q_Err | ERR value (error state) |
| Q_Oscillate | Oscillating value (On <-> Off). The system sets a value as |
the one
| Kotva |
|---|
| pociatocne_hodnoty |
|---|
| pociatocne_hodnoty |
|---|
|
Initial values of I/O tags after starting D2000 system and after restarting ...
If no control object and no default value are defined for an I/O tag, its value will be invalid after starting the D2000 system.
After restarting process the D2000 KOM, process process is (re)started, it internally invalidates the values of all I/O tags. This could be undesirable behaviour (e.g. the values of output I/O tags in server protocols), therefore starting process D2000 KOM with the parameter /KI allows to enable loading reading the initial values of I/O tags (input as well as output ones) from process the D2000 Server process after starting process the D2000 KOM process.
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