PSM Arithmetic, Example Of PSM Function - GF54.21-D-3055-01TSB
Model 907
with code ED5 (Parameterisable special module)
Display dimming, filter block
Display dimming function blocks
Display dimming
The display dimming (interior CAN (CAN B): "SwillLvl") can be output on one of the pulse-width-modulation-compatible outputs (A).
| Value range of pulse width modulated signal | 0 to 100 % |
| Frequency | 500 Hz |
If "Term15R_Actv" = "1", the control units with display only use the "SwillLvl" value (W) for their display illumination.
If "Term15R_Actv" = "0" (terminal 15R OFF) and "PosnLmp_On_Rq" = "1" (standing lights ON), the currently transmitted "SwillLvl" value (W) is set and remains stored and set during the transition to bus idle for as long as the control unit is active.
If "Term15R_Actv" = "0" (terminal 15R OFF) and "PosnLmp_On_Rq" = "0" (standing lights OFF), the value (W) 70 % is set.
A switched-off control unit which is activated locally with bus idle and has not currently stored and set a "SwillLvl" value (W) also sets the value (W) 70 %.
During transition to bus idle, the current value (W) for "SwillLvl" has to be stored locally.
The display dimming functions are specified through the programmable logic controller (PLC) group, arithmetic unit and multifunction output blocks. The picture above shows the simplified linking of the function blocks. The configuration is available in the tables.
Function description of implementation
Comparator 2, calculation step 3 (Comp 2):
- Limit the valid value range of the input signal to 0 to 100 %; if the value (W) is above 100, 100 is output as the result (E) for the current "SwillLvl" value (W).
Arithmetic unit memory (Memory 1):
- Stores the current comparator value if the interior CAN (CAN B) is active. The last stored value (W) is output if the interior CAN (CAN B) is inactive.
Value table 1 (WT1):
- Prioritizes the input information "STL_EIN" (low) and "Term15R_Actv" (high), and - depending on the input activities - it outputs the current "SwillLvl" value (W), the stored "SvillLvl" value (W) or the default value.
Calculation block 1, calculation step 1 (Calc 1):
- Calculates the current pulse width modulation (PWM) specified value from the result (E) of value table 1 (WT1).
Filter 1, calculation step 2 (F 1):
- Filters the PWM value (W) to be configured from the PWM specified value so that appropriate dimming is executed.
Multifunction output block (MFA 6):
- Outputs the PWM value (W) at the output (A).
Multifunction output block (MFA 6), filter setting:
- None
| Block | Input | Signal name | Category | Compare operation |
|---|---|---|---|---|
| Comparator 2 | Compare_2_a | Out_AU_Const_2 | Arithmetic unit constant | Input a (a) ≥ Input b (b) |
| Arithmetic unit | Compare_2_b | SwillLvl | Interior CAN (CAN B), receive signals | |
| - | Compare_2_c | SwillLvl | Interior CAN (CAN B), receive signals | |
| - | Compare_2_d | Out_G12_K1_value | PLC group 12 |
| Block | Input | Signal name | Category |
|---|---|---|---|
| WT1 | Value table 1 default value | Out_G12_K1_value | PLC group 12 |
| PLCG12 | Value table 1 value 1 | Out_AU_Memory_1 | Arithmetic unit |
| - | Value table 1 value 2 | Out_AU_Compare_2 | Arithmetic unit |
| - | WT1_1 (value 1) | PosnLmp_On_Rq | Interior CAN (CAN B), receive signals |
| - | WT1_2 (Value 2) | Term15R Actv | Interior CAN (CAN B), receive signals |
| - | WT1_3 (value 3) to WT1_4 (value 4) | Const_Bit_0 | Constant |
| Block | Input | Signal name | Category | Activation delay (20 ms steps) |
|---|---|---|---|---|
| Memory block 1 | Memory_1_value | Out_AU_Compare_2 | Arithmetic unit | 0 |
| Arithmetic unit | Memory_1_Enable | MPMi_CAN_B_awake | Internal signals of parameterizable special module (PSM) |
| Block | Input | Signal name | Category | Parameter | Contents |
|---|---|---|---|---|---|
| Calc1 | Calc_1_a | Out_G12_WT1 | PLC group 12 | Arithmetic operation assignment | Step 1 |
| Arithmetic unit | Calc 1 b | Const Bit 0 | Constant | Lim. High | 10 000 |
| - | Calc_1_c | Out_AU_Const_2 | Arithmetic unit | Lim. Low | 0 |
| - | Calc_1_d | Const_Bit_1 | Constant | Type "+/-" | "+" |
| Block | Input | Signal name | Category | Parameter | Contents |
|---|---|---|---|---|---|
| Filter_1 | Filter_1 | Out_AU_Calc1 | Arithmetic unit | Calculation assignment | Step 2 (0) |
| Arithmetic unit | - | - | - | Model | Ramp (1) |
| - | - | - | - | Filter stages/ramp increase | 100 |
| Block | Parameter | Contents |
|---|---|---|
| Const_G12 | Out_G12_K1_value | 70 |
| Const AU | Out AU Const 1 | 5 000 |
| - | Out_AU_Const_2 | 100 |
| Block | Input | Signal name | Category | Parameter | Contents |
|---|---|---|---|---|---|
| MFA 6 | MFA6_Input1 (active) | Const Bit 1 | Constant | - | - |
| - | MFA6_Input2 (const/puls) | Const_Bit_0 | Constant | Model | Output (1) |
| - | MFA6_Input3 (CutOffReset) | Term15_Actv | Interior CAN (CAN B), receive signals | Reactivation attempts | 1 |
| - | MFA6_Input4 (cycle time) | Const_Bit_0 | Constant | PWM type | Frequency (0) |
| - | MFA6_Input5 (pulse time) | Const Bit 0 | Constant | - | - |
| - | MFA6_Input6 (PWM active) | Const_Bit_1 | Constant | - | - |
| - | MFA6_Input7 (PWM period) | Out_AU_Const_1 | Arithmetic unit | - | - |
| - | MFA6_Input8 (PWM duty) | Out_AU_Filter_1 | Arithmetic unit | - | - |