SEL_PID3: Selector 3 for PID, output values.
Block SEL_PID3 (FB453) forms a selector function (n-to-1 assignment) together with SEL_PID1 and SEL_PID2.
Block SEL_PID3 outputs the enabled 4 input values (SEL_PID1, SEL_PID2).
Principle of operation
Blocks SEL_PID1 and SEL_PID2 bundle 4 inputs each. The enabled input values [EnInVal] = True, are read in sequence by block SEL_PID3 and outputted.
Inputs
Pin | E | Description |
BlkRefIn | pa | Block reference input Interconnection with SEL_PID1 or SEL_PID2. This implements selector function (n-to-1). |
Outputs
Pin | E | Description | |
To higher neighbor element 1. | pa | To higher neighbor element 1. Record input value | |
ToLo1 | pa | To lower neighbor element 1. Record input value | |
ToHi2 | pa | To higher neighboring element 2 Record input value | |
ToLo2 | pa | To lower neighboring element 2 Record input value | |
ErrRef | pa | Reference error | |
1 (Yes) | No values are outputted at block SEL_PID3.
| ||
0 (No) | Normal function. | ||
Note
If no input block SEL_PID1, SEL_PID2 is enabled, SEL_PID3 outputs the following Default values for pins ToHi1, ToLo1, ToHi2, ToLo2:
.CtlMod := 1
.Crdn := 1
.Ctkn := 1
.IsInt := FALSE
.DeltaE := 0.0
Engineering selector function (n-to-1)
Together, blocks SEL_PID1, SEL_PID2 and SEL_PID3 form a selector function (n-to-1).
The following interconnection is important for the correct function.
- Block SEL_PID1 is the first block in the interconnection sequence. It bundles the first 4 inputs.
- One or more SEL_PID2 each bundle additional inputs. Blocks are interconnected to one another via [BlkRefIn] and [BlkRefO].
- Block SEL_PID3 concludes the selector function. It is interconnected via [BlkRefIn] and [BlkRefO] with SEL_PID1 or SEL_PID2.
- The processing sequence is important to proper functioning and must be optimized prior to compiling the chart using the CFC command Optimize chart.
- Only a single block (SEL_PID1, SEL_PID2) is enabled (the last enabled SEL_PID2 in the processing sequence has precedence).
Note: During the initial programming loop, it checks whether interconnection is correct and whether the version of the three blocks is identical. If not, [ErrRef] = 1 (Yes) and no input values are outputted on block SEL_PID3.
Process response
Standard (see General rules and information).
Troubleshooting
Standard (see General rules and information).