Development of the control system of a car charging station
5 Enrollments Level : IntermediateRelevance
Against the backdrop of the increasing number of charging stations for electric vehicles currently available, this BB aims to expand and consolidate programming skills in S7 PLCs using a simple charging station in the underground car park of a residential building as a project basis. The difference between electrical power and electrical work also becomes particularly clear through programming in this practical context.
Abstract
The charging station includes a human-machine interface where the user makes two essential inputs. The first is the desired charging power and the desired energy to be charged. If the latter value exceeds the maximum chargeable battery capacity, the charging process is automatically stopped when the battery is full. The charging power is not entered directly but is determined automatically and depends on the grid status, the cable used and the status of the vehicle battery (the battery management system requests derating when the battery is almost full, for example). The actual charging power is then set by the on-board charger. In this exercise and calculation, it is assumed for the sake of simplicity that the charging power set and desired by parameters corresponds to the actual charging power. This functionality is implemented using Siemens S7 PLC and achieved through programming using the TIA-Portal software.
Learning Outcomes
The learner can
- program a cyclic interrupt OB to correctly sum analog values
- gain in-depth experience of the difference between electrical power and electrical work in a practical context
- configure and commission a graphical user interface (fully possible via simulation or (better) with real devices)
Prior Knowledge
The learner is able to
- apply and expand job-specific
- independently process new subject content
Keywords
- S7
- TIA Portal
- PLC
- Function block
- Organisation block
- Cyclic Interrupt
Elements
1. About this Building Block
About this Building Block
The charging station includes a human-machine interface where the user makes two essential inputs. The first is the desired charging power and the desired energy to be charged. If the latter value exceeds the maximum chargeable battery capacity, the charging process is automatically stopped when the battery is full. The charging power is not entered directly but is determined automatically and depends on the grid status, the cable used and the status of the vehicle battery (the battery management system requests derating when the battery is almost full, for example). The actual charging power is then set by the on-board charger. In this exercise and calculation, it is assumed for the sake of simplicity that the charging power set and desired by parameters corresponds to the actual charging power. This functionality is implemented using Siemens S7 PLC and achieved through programming using the TIA-Portal software.
2. Reader
reader
3. Exercises
exercises
4. DATA
data
file: SoftwarePrintout.pdf: Printout of the S7-Software (function blocks and data blocks)
file: ...zap16: completely finished TIAv16 - Project file (an installed version of TIP-Portal v16 or higher version is necessary to open it)