คอนแทคเตอร์,เบรกเกอร์,อินเวอร์เตอร์พลังงานแสงอาทิตย์,มิเตอร์ไฟฟ้า,แบตเตอรี่พลังงานแสงอาทิตย์
The pricing of custom PLC control cabinets follows the core logic of cost accumulation + reasonable profit. It consists of five major components: hardware cost, labor cost, technical service cost, additional cost, and profit & taxes. The final quotation is dynamically adjusted based on project complexity, brand selection, and delivery requirements.
- Core Pricing Components (Sorted by Weight)
| Cost Category | Proportion | Core Components | Calculation Method |
| Hardware Cost | 50%~70% | PLC system, low-voltage components, cabinet, auxiliary materials | Calculated item by item according to BOM, including 1.03~1.05 loss rate |
| Labor Cost | 15%~25% | Design, การประกอบ, wiring, commissioning | Working hours hourly rate (200~500 RMB/hour) |
| Technical Service Cost | 5%~15% | Programming, system integration, on-site commissioning | Charged by project complexity and I/O points |
| Additional Cost | 3%~10% | Transportation, packaging, warranty, management expenses | Allocated as a fixed percentage of the total of the first three costs |
| Profit & Taxes | 10%~30% | Corporate profit, VAT (13%) | Calculated based on target profit margin on total cost |
- Detailed Calculation Methods for Each Cost Item
2.1 Hardware Cost (Core Basis)
(1) PLC Core System (40%~60% of Hardware Cost)
| Component | Price Range | Calculation Key Points |
| PLC Main Unit | ภายในประเทศ: 2,000~8,000 RMB | Graded by CPU performance, memory, and communication capability |
| Imported: 5,000~30,000 RMB | ||
| Digital I/O Modules | 300~800 RMB/point | Unit price number of channels, กับ 10% reserved for expansion |
| Analog Modules | 800~2,000 RMB/point | เช่น, FX5-4DA, 4-channel approx. 3,200~8,000 RMB |
| Special Function Modules | 1,500~10,000 RMB/unit | Motion control, communication expansion, high-speed counting, ฯลฯ. |
| HMI | 1,000~10,000 RMB | 7-inch touch screen approx. 2,000~4,000 RMB; 10-inch approx. 4,000~8,000 RMB |
(2) Low-Voltage Electrical Components (20%~30% of Hardware Cost)
| Category | Price Range | Selection Impact |
| เบรกเกอร์ | 50~500 RMB/unit | By current rating (16A~630A) and tripping curve |
| คอนแทคเตอร์ | 100~800 RMB/unit | By power rating (10A~400A) and brand |
| รีเลย์ | 20~100 RMB/unit | Electromagnetic type is cheaper; solid-state type is 3~5 times more expensive |
| Power Supply | 200~1,500 RMB | By output power (24V/10A~40A) |
| เทอร์มินัลบล็อก / DIN Rails | 50~500 RMB | By number of points and installation requirements |
(3) Cabinet & Structural Parts (10%~20% of Hardware Cost)
| วัสดุ / ข้อมูลจำเพาะ | Price Range | Selection Key Points |
| Carbon Steel Cabinet | 800~3,000 RMB | Standard size (800*600*2200มม), protection class IP20~IP54 |
| Stainless Steel Cabinet | 2,000~8,000 RMB | For corrosive environments, material 304/316 |
| Cooling / Lighting System | 200~1,000 RMB | Fans, เครื่องปรับอากาศ, lamps, calculated by cabinet size and power |
| Auxiliary Materials | 5%~8% of hardware cost | Cables, wiring ducts, wire markers, cable ties, ฯลฯ. |
2.2 Labor Cost (Calculated by Process)
| Process | Estimated Hours | Unit Price Range | Calculation Notes |
| Electrical Design | 2~8 hours | 300~500 RMB/hour | Including schematic, layout, BOM list design |
| Cabinet Assembly | 4~16 hours | 200~350 RMB/hour | Including component installation, rail fixing, panel machining |
| Wiring | 10~40 hours | 150~300 RMB/hour | Calculated by points (ประมาณ. 0.5~1 hour/point) |
| In-Plant Testing | 2~8 hours | 250~400 RMB/hour | Including power-on test, function verification, parameter calibration |
2.3 Technical Service Cost (By Project Type)
| Service Type | Charging Method | Price Range |
| PLC Programming | By points: Digital 50~100 RMB/point | Basic logic control: 1,000~5,000 RMB |
| Analog 200~500 RMB/point | Complex system: 5,000~20,000 RMB | |
| HMI Screen Design | By number of screens: 100~300 RMB/page | Under 10 pages: 1,000~3,000 RMB |
| เกิน 10 pages: 3,000~10,000 RMB | ||
| System Integration | By complexity: 5%~15% of total hardware cost | Including communication configuration, data interaction, third-party equipment docking |
| On-Site Commissioning | By day: 1,500~3,000 RMB/day | Including equipment linkage, parameter optimization, personnel training |
2.4 Additional Cost (Indirect Expenses)
| Item | Calculation Method | หมายเหตุ |
| Transportation Cost | By distance: 2~8 RMB/km | Including insurance; cross-province transportation +5%~10% |
| or by weight/volume | ||
| Packaging Cost | 200~1,000 RMB/unit | Export must comply with IPPC standards, +30%~50% |
| Warranty Service | 3%~5% of hardware cost per year | 1~3 years warranty, including spare parts and technical support |
| Management Expenses | 3%~8% of total of first three costs | Including office, personnel, equipment depreciation, ฯลฯ. |
2.5 Profit & Taxes (Final Pricing)
Corporate Profit: Set according to market competition; 10%~20% for standard projects, up to 20%~30% for complex custom projects
VAT: Fixed rate 13% (calculated on total price excluding tax)
Final Quotation = (Hardware Cost + Labor Cost + Technical Service Cost + Additional Cost) × (1 + Profit Margin) × 1.13
- Key Factors Affecting Price (Dynamic Adjustment Items)
| Factor | Price Adjustment Range | Decision Points |
| Brand Selection | Domestic vs Imported: ±30%~50% | Imported brands (ซีเมนส์ / Mitsubishi / ชไนเดอร์) cost more but offer better stability |
| I/O Points | +5%~15% per 10 additional points | More points increase both hardware and programming costs |
| ระดับการป้องกัน | IP20→IP65: +20%~80% | Outdoor / explosion-proof requirements greatly increase cost |
| Project Complexity | Standard vs Custom: ±10%~50% | Motion control, PID regulation, network communication increase programming cost |
| รอบการจัดส่ง | Normal → Urgent: +10%~30% | Delivery in less than 2 weeks requires overtime and rush fees |
| Bulk Purchase | 1 unit → 10 หน่วย: -10%~25% | Scale effect reduces unit cost; manufacturers provide tiered discounts |
- Typical Project Quotation Case Analysis
Case 1: Small Automation Equipment PLC Cabinet
(20 จาก / 16 ทำ / 2 AI / 2 ถึง)
| Cost Item | Amount (หยวน) | Proportion | Description |
| Hardware Cost | 18,500 | 65% | Mitsubishi FX5U + FX5-4DA + low-voltage components + carbon steel cabinet |
| Labor Cost | 5,200 | 18% | Design 4h + Assembly 8h + Wiring 16h + Testing 4h |
| Technical Service Cost | 2,800 | 10% | Programming + 2 days on-site commissioning |
| Additional Cost | 1,500 | 5% | Transportation + Packaging + Warranty |
| Total Cost | 28,000 | – | – |
| Profit (15%) + Taxes (13%) | 7,840 | 28% | – |
| Final Quotation | 35,840 | 100% | – |
Case 2: Medium Production Line PLC Cabinet
(64 จาก / 48 ทำ / 8 AI / 8 ถึง + Touch Screen)
| Cost Item | Amount (หยวน) | Proportion | Description |
| Hardware Cost | 48,000 | 60% | Siemens S7-1200 + SM 1232 + 10-inch HMI + stainless steel cabinet |
| Labor Cost | 16,000 | 20% | Design 8h + Assembly 16h + Wiring 32h + Testing 8h |
| Technical Service Cost | 10,000 | 12.50% | Complex programming + system integration + 5 days on-site commissioning |
| Additional Cost | 6,000 | 7.50% | Transportation + Packaging + 3-year warranty |
| Total Cost | 80,000 | – | – |
| Profit (20%) + Taxes (13%) | 21,280 | 26.60% | – |
| Final Quotation | 101,280 | 100% | – |
- Quotation Optimization & Cost Control Strategies
- Hardware Selection Optimization
Reserve 10%~20% expansion space for I/O points to avoid later modification
Use imported brands for key components, high-quality domestic brands (เช่น, ชินท์ / อร่อย) for auxiliary parts
Prioritize highly integrated PLCs (เช่น, FX5U-4DA with built-in analog) to reduce expansion module costs
- Labor Cost Control
Adopt standardized design templates to reduce repetitive work
Modular assembly to improve efficiency
Plan wiring process in advance to reduce rework
- Technical Service Efficiency
Use structured programming to improve program reusability
Fully pre-commission in the factory to reduce on-site debugging time
Provide detailed documentation to lower training costs
- Bulk Purchase Advantage
Unified procurement for multiple cabinets in the same project to obtain manufacturer discounts
Sign framework agreements with long-term suppliers to lock in prices
- Standard Quotation Process & หมายเหตุ
6.1 Standard Quotation Process
- Requirement Confirmation: Clarify I/O points, functions, brand preference, protection class, delivery cycle
- Solution Design: Provide schematics, layout drawings, BOM list, confirm technical feasibility
- Cost Accounting: Calculate item by item using the above method, generate detailed cost sheet
- Quotation Generation: Form official quotation based on market conditions and profit target
- Business Negotiation: Adjust configuration according to customer budget, balance cost and profit
- Contract Signing: Specify technical parameters, delivery time, warranty terms, payment terms
6.2 Quotation Notes
Risk Reserve: Reserve 5%~10% adjustment space when raw material prices fluctuate greatly
Clear Scope: Clearly define inclusions / exclusions (เช่น, whether on-site installation, training are included)
Technical Clarification: Clarify complex functions in advance to avoid cost increases from later changes
Payment Terms: 30%~50% advance payment; 80%~90% before shipment; balance after acceptance
- สรุป & Quick Estimation Formulas
Pricing custom PLC control cabinets is a systematic project, with the core being accurate cost calculation + reasonable profit expectation.
According to project scale, the following quick estimation formulas can be used:
Small Projects (< 32 I/O points):
Total Price ≈ Hardware Cost × (1 + 0.8~1.2)
(including labor, service, profit)
Medium Projects (32~128 I/O points):
Total Price ≈ Hardware Cost × (1 + 1.0~1.5)
Large Projects (> 128 I/O points):
Total Price ≈ Hardware Cost × (1 + 1.2~2.0)
