About LK Large-Scale PLC
LK Large Scale PLC is designed for medium to large-scale control systems and high-performance control applications. It boasts single CPU and dual-rack redundant CPU design, ensuring fast operation and stable control. Drawing upon over 20 years of professional expertise, LK offers reliable, innovative factory automation, evolving for better reliability. With 10,000+ global installations, LK is rigorously validated for optimal performance.
Product Features
High Reliability
· Field-to-system and channel-to-channel isolation
· Fault diagnosis, limit alarm, and fail-safe output
· MRAM non-volatile memory for power-loss data retention
Harsh Environmental Adaptability
· Operating temperature from -20°C to +70°C
· Storage temperature from -40°C to +80ºC
· PCB with conformal coating
· Compliant with EMC standards (IEC61000-4/IEC61131-2)
High Performance
· Less than 100 ms of CPU switchover time
· Less than 100 μs of minimum task scheduling time
· Less than 200 ms of loop response time
Easy to Use
· Hot swap for all modules
· Foolproof design for module mounting
Technical Data
| Model |
LK220 |
LK222 |
LK224 |
| Controller clock speed |
600MHz |
667MHz |
766MHz |
| Instruction execution time |
Bit operation |
15 ns |
10 ns |
7 ns |
| Fixed-point operation |
25 ns |
10 ns |
7 ns |
| Floating-point operation |
25 ns |
18 ns |
12 ns |
| Memory |
Integrated memory (program + data) |
24 MB |
32 MB |
64 MB |
| Power-loss retentive memory |
512 KB MRAM (R area: 64 KB;M area: 4 KB) |
512 KB MRAM(R area: 96 KB;M area: 6 KB) |
512KBMRAM(R area: 128 KB; M area: 8 KB) |
| Communication interface |
Integrated Ethernet |
2 × RJ45 Interface, 10/100M adaptive, dual-network-port redundancy;supporting Modbus TCP and HolliTCP protocols |
| Communication protocols |
Modbus TCP (max.master/slave connections) |
16 |
32 |
64 |
| Powerlink (max. PL slaves) |
128 |
256 |
256 |
| Profibus-DP (max. PL slaves) |
124 |
124 |
124 |
| Communication modules |
LK240 × 1, LK249 × 1, LK246 × 2, LK241 × 1 |
LK240 × 1, LK249 × 1, LK246 × 2, LK241 × 2 |
LK240 × 1, LK249 × 1, LK246 × 2, LK241 × 2 |
| Configuration capacity |
Input variable area (I) |
32 KB max. |
64 KB max. |
128 KB max. |
| Output variable area (Q) |
32 KB max. |
64 KB max. |
128 KB max. |
| Global variable area (N) |
1 MB |
4 MB |
6 MB |
| Free variable area (M) |
1 MB |
2 MB |
4 MB |
| Power-loss retentivearea ® |
64 KB max. |
96 KB max. |
128 KB max. |
Packaging & Delivery
| Category |
International Commercial Terms (Incoterms) |
Terms of Payment |
Nearest Port |
| LK Large Scale PLC |
CIF, CFR, DAP |
LC, T/T, D/P |
Shanghai, Guangzhou, Tianjin |
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Company Profile
Audited Supplier 
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