# Abs3P
## `Abs3P` (FB)
FUNCTION\_BLOCK Abs3P
### Short description
> Anti-blocking protection for a 3-point drive
### Representation
### Interfaces
#### Inputs
| Name | Data type | Value range | Initial value | Function |
| ---------- | --------- | ----------- | ------------- | ---------------------- |
| *xFbOpen* | BOOL | | | Signal - Input - Plus |
| *XFbClose* | BOOL | | | Signal - Input - Minus |
#### Outputs
| Name | Data type | Value range | Initial value | Function |
| ------------- | --------------- | ----------- | ------------- | ------------------------------------------------- |
| *xOutOpen* | BOOL | | | Enable - Output - Plus |
| *xOutClose* | BOOL | | | Enable - Output - Minus |
| *xAbsOn* | BOOL | | | Indicator - anti-blocking process |
| *dtAbsLastOn* | DATE\_AND\_TIME | | | Start date/time of the last anti-blocking process |
#### Setpoints / parameters
| Name | Data type | Value range | Initial value | Function |
| ---------------- | --------- | ----------- | ------------- | --------------------------------------- |
| **tMinRunTime** | TIME | | 30s | Minimum run time |
| **tTime** | TIME | | 120s | Duration of the anti-blocking process |
| **eDay** | eDoW | | eDow\.Monday | Weekday of the anti-blocking process |
| **todStartTime** | TOD | | 08:00:00 | Start time of the anti-blocking process |
### Function description
#### General
This function block is used to monitor the signal inputs *xFbOpen* and *XFbClose* for activity. The inspection period always covers 168 hours (= 1 week).\
The signal inputs *xFbOpen* and *XFbClose* are active if they are continuously active during the minimum run time within the inspection period **tMinRunTime** only (Only *xFbOpen* or only *XFbClose* or both).\
This prevents the anti-blocking process, and the inspection period starts again.\
\
If no activity was detected during the inspection period, the anti-blocking process is triggered on the weekday **eDay** at the time **todStartTime** .\
At the same time the inspection period starts again.\
\
The active anti-blocking process is divided into two consecutive time sections (Section 1 and Section 2)\
In Section 1, during the time duration **tTime** the combination Enable - Output *xOutOpen* = TRUE, Enable - Output *xOutClose* = FALSE is output.\
In Section 2, during the time duration **tTime** the combination Enable - Output *xOutOpen* = FALSE, Enable - Output *xOutClose* = TRUE is output.\
\
The initial triggering of the anti-blocking process can be delayed depending on the relevant settings (weekday **eDay** and **todStartTime**).
> **Example**
>
> Inspection period ended on Tuesday morning, triggering of the anti-blocking process only on the following Monday.
At the output *dtAbsLastOn* the start date and start time of the last anti-blocking process are available.
> **Prerequisite for using the function block Abs3P**
>
> The use of the TimeRead2 function block is required for correct operation.
#### Enable - Output *xOutOpen*
| *xFbOpen* | Anti-blocking process | *xOutOpen* | Notes |
| --------- | --------------------- | ---------- | ---------------------------------------- |
| X | FALSE | FALSE | Anti-blocking process not active |
| X | TRUE | TRUE | Anti-blocking process active - Section 1 |
| X | TRUE | FALSE | Anti-blocking process active - Section 2 |
Legend: X = any
#### Enable - Output *xOutClose*
| *xFbClose* | Anti-blocking process | *xOutClose* | Notes |
| ---------- | --------------------- | ----------- | ---------------------------------------- |
| X | FALSE | FALSE | Anti-blocking process not active |
| X | TRUE | FALSE | Anti-blocking process active - Section 1 |
| X | TRUE | TRUE | Anti-blocking process active - Section 2 |
Legend: X = any
#### Indicator - anti-blocking process *xAbsOn*
This output is used to indicate an active anti-blocking process (*xAbsOn* = TRUE).
#### Setpoint / parameters **eDay**
The anti-blocking function can be globally disabled by setting **eDay** = eDow\.Inactive.
#### Setpoint / parameters **tTime**
The anti-blocking function can be globally disabled by setting **tTime** = 0s can be globally disabled.
### CODESYS
InOut:
| Scope | Name | Type | Initial |
| ----------- | -------------- | ------ | ----------------- |
| Input | `xFbOpen` | `BOOL` | |
| Input | `xFbClose` | `BOOL` | |
| Input Const | `tMinRunTime` | `TIME` | TIME#30s0ms |
| Input Const | `tTime` | `TIME` | TIME#2m0s0ms |
| Input Const | `eDay` | eDoW | eDow\.Monday |
| Input Const | `todStartTime` | `TOD` | TIME\_OF\_DAY#8:0 |
| Output | `xOutOpen` | `BOOL` | |
| Output | `xOutClose` | `BOOL` | |
| Output | `xAbsOn` | `BOOL` | |
| Output | `dtAbsLastOn` | `DT` | |
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