FB_BA_FdbCtrlBinary
![FB_BA_FdbCtrlBinary 1:](Images/gif/9275557259__Web.gif)
The function block FB_BA_FdbCtrlBinary is used for feedback monitoring of an actuator by means of digital feedback. Application examples of the function block are, for example, an operation feedback monitoring, a process feedback monitoring or the run monitoring of a drive by means of limit switches.
The function block monitors a limit switch in two steps, for example. Step 1 includes monitoring while the actuator is moving. Step 2 includes monitoring of the opened state of the actuator.
Step 1: If a TRUE is present at the input bActuator, then the travel time of the actuator nFdbDelay/nRemTiFdbDelay expires. If no TRUE is present at input bSwitch within this time, this is indicated via output bQ. If bSwitch becomes TRUE within the time nFdbDelay, step 1 is complete and step 2 becomes active.
Step 2: bActuator and bSwitch are TRUE. If bActuator becomes FALSE, step 1 becomes active again. If bSwitch becomes FALSE and within the time nInterruptionDelay/nRemTiInterruptionDelay is not TRUE again, this is indicated via the output bQ.
In addition, the idle position of the actuator is monitored. That is, if bActuator is not active and the feedback signal bSwitch indicates a TRUE, then after the time nFdbDelay has elapsed, the output bQ is set to TRUE.
bQ signals that the monitoring of the feedback signal has a fault.
Inputs
VAR_INPUT
bEn : BOOL;
bActuator : BOOL;
bSwitch : BOOL;
nFdbDelay : UDINT;
nInterruptionDelay : UDINT;
END_VAR
Name | Type | Description |
---|---|---|
bEn | BOOL | General enable of the function block. If bEn is FALSE, the message output bQ is also FALSE. |
bActuator | BOOL | The switching actuator output of the aggregate to be monitored is connected to this input. |
bSwitch | BOOL | Used to connect the feedback signal, e.g. of a differential pressure switch, flow monitor or limit switch. |
nFdbDelay | UDINT | Response delay [s] of the monitoring function when the actuator is started. The input of the time is limited to the global parameter BAComn_Global.udiMaxSecInMilli from the Tc3_BA2_Common library (see BAComn_Global). |
nInterruptionDelay | UDINT | Delay time (e.g. of a limit switch) in the open state in [s]. The input of the time is limited to the global parameter BAComn_Global.udiMaxSecInMilli from the Tc3_BA2_Common library, see (BAComn_Global). |
Outputs
VAR_OUTPUT
bQ : BOOL;
nRemTiFdbDelay : UDINT;
nRemTiInterruptionDelay : UDINT;
END_VAR
Name | Type | Description |
---|---|---|
bQ | BOOL | bQ is used to signal that the monitoring of the feedback signal indicates a fault. |
nRemTiFdbDelay | UDINT | Remaining time [s] until output bQ is set. The default comes from nFdbDelay. |
nRemTiInterruptionDelay | UDINT | Remaining time [s] until output bQ is set. The default comes from nInterruptionDelay. |
Requirements
Development environment | Required PLC library |
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TwinCAT from v3.1.4024.22 | Tc3_BA2 from v5.2.5.0 |