ERP untuk Industri Manufaktur: MRP, Production Planning, dan Quality Control

ERP Manufaktur: Bedanya dengan ERP Umum

ERP manufaktur tidak hanya mencatat transaksi—ia mengontrol dan mengoptimalkan produksi fisik. Modul manufaktur mengintegrasikan engineering (BOM, routing) dengan operasional (scheduling, shop floor, quality, costing) dalam satu loop tertutup.

Modul Kunci Manufaktur di ERP

1. Engineering & Product Data Management

Bill of Materials (BOM): Multi-level, phantom, planning, manufacturing, costing BOM. Revision control (ECO/ECR), effectivity date, where-used analysis
Routing/Operations: Work center, operation sequence, setup/run time, crew size, overlap, move/wait time, subcontract operations
Engineering Change Management: Change request → impact analysis (cost, inventory, schedule) → approval → effectivity → mass replace
Document Management: Drawing, spec, work instruction, video linked ke BOM/routing/revision

2. Material Requirement Planning (MRP)

Jantung perencanaan material. MRP menjawab: Apa, Berapa, Kapan butuh dibeli/diproduksi.

Inputs: MPS (Master Production Schedule), BOM, Inventory On Hand, Open PO/WO, Safety Stock, Lead Time
Outputs: Planned Orders (Make/Buy), Reschedule Notices (Expedite/Defer), Exception Messages
MRP Types: Regenerative (full) vs Net Change (incremental). Frequency: Daily/Weekly
Advanced: DRP (Distribution Requirements Planning), Multi-plant MRP, MRP dengan constraints (Capacity Constrained MRP / Advanced Planning & Scheduling – APS)

3. Master Production Scheduling (MPS)

Demand Sources: Forecast, Customer Order, Spare Parts, Interplant, Safety Stock
Time Fence: Frozen (no auto change), Firm (manual change only), Free (MRP driven)
Available to Promise (ATP): Real-time promise date berdasarkan MPS, inventory, WIP, capacity
Rough-Cut Capacity Planning (RCCP): Validasi MPS vs capacity kritis (bottleneck work center) sebelum MRP run

4. Production Execution (Shop Floor Control)

5. Quality Management (QM/QC)

Incoming Inspection (IQC): PO-based sampling plan (AQL), disposition (accept/reject/rework), vendor notification
In-Process Inspection (IPQC): First article, patrol, critical characteristic (SPC/CPK), hold/release WO
Final Inspection (FQC/OQC): Finished goods sampling, CoA (Certificate of Analysis), label/pack check
Non-Conformance (NCR/NCR): Root cause (8D/5Why), CAPA, effectiveness check, trend analysis
Supplier Quality: Scorecard (PPM, on-time, corrective action closure), certified supplier program
Calibration/Gage R&R: Instrument tracking, calibration schedule, MSA studies

6. Product Costing & Variance Analysis

Standard Cost: Roll-up dari BOM + Routing (Material + Labor + Overhead). Update berkala (tahunan/kuartalan)
Actual Cost Collection: Material actual (PO price variance), Labor actual (rate/efficiency variance), Overhead absorption (rate/volume variance)
Variance Analysis: Purchase Price Variance (PPV), Usage Variance, Labor Rate/Efficiency, Overhead Spend/Volume, Yield/Scrap
Work-in-Process (WIP) Valuation: Method: Standard, Actual, Weighted Average. Month-end revaluation

Tipe Manufaktur & Kebutuhan ERP Khusus

Fungsi	Deskripsi	Integrasi
Work Order Release	Release WO berdasarkan material & capacity ready	MRP → WO, Material Issue, Routing
Material Issue (Backflush/Manual)	Kit picking, component issue, scrap reporting	Inventory → WIP, Lot/Serial trace
Operation Reporting	Start/Complete, quantity good/scrap, time actual vs standard	Labor tracking, OEE, cost collection
Move Transactions	Queue → Move → Wait → Next Op	WIP tracking, lead time actual
Completion & Receipt	Finish goods receipt, by-product/co-product	Inventory ↑, Cost variance
Close/Complete WO	Final costing, variance analysis, close	GL, Cost Accounting, Engineering

Tipe	Karakteristik	Fokus ERP
Make-to-Stock (MTS)	Forecast-driven, volume tinggi, varian rendah	Demand planning, MRP efficiency, inventory optimization
Make-to-Order (MTO)	Order-driven, engineered, lead time kritis	Project-based, ATP, scheduling, cost tracking per job
Assemble-to-Order (ATO)	Modular, configure di final assembly	Configurator, phantom BOM, MRP di level sub-assy
Engineer-to-Order (ETO)	Custom design per order, project-based	Project management, ECO, cost-plus billing, WIP tracking
Process/Batch	Formula/recipe, yield variable, by-product	Recipe management, potency, catch weight, co/by-product costing
Repetitive/Line	Flow line, takt time, minimal WIP	Rate-based scheduling, backflush, line balancing, OEE

KPI Manufaktur di ERP

OEE (Overall Equipment Effectiveness): Availability × Performance × Quality
On-Time Delivery (OTD): Customer promise date vs actual ship
Schedule Adherence: Actual vs planned start/complete
First Pass Yield (FPY): Good units / Total started (no rework)
Scrap & Rework Rate: Cost of poor quality / Total production cost
Inventory Turns (Raw, WIP, FG): COGS / Avg Inventory per category
Manufacturing Cost Variance: Actual vs Standard per WO/Period
Capacity Utilization: Actual hours / Available hours (bottleneck focus)

Kesimpulan

ERP manufaktur menghubungkan Engineering → Planning → Execution → Quality → Costing dalam satu data flow. Kunci sukses: BOM/routing akurat (99%+), data master bersih, disciplin transaksi shop floor (real-time), dan closed-loop variance analysis. Integrasi dengan MES/IoT/APS mengangkat ERP dari system of record ke system of intelligence.