MASTER-K Series PLC Compact All In One PLC Controller For Small Automation Systems
The MASTER-K series PLC is a programmable logic controller designed by LS Electric for small-scale standalone machinery applications. Available in two configurations—all-in-one modules and modular units—this series features high-speed processing, comprehensive communication capabilities, and flexible expandability, making it ideal for small-to-medium-sized industrial automation control scenarios.
These compact units integrate CPU, digital I/O, and power supply into a single housing, perfect for space-constrained installations with simplified functionality. Key models include MASTER-K 10S1, 80S, and 120S.
- The 120S series includes Economy Models (10/14/20/30 I/O points, expandable to 70 points) and Standard Models (20/30/40/60 I/O points, expandable to 120 points)
Models include MK200S, MK300S, and MK1000S. These feature card-based power supply, CPU, digital I/O, and special function modules, allowing fully customized system configurations with I/O point ranges from 14 to 1024 points.
- High-speed Processing: Basic instruction execution speeds range from 0.1 to 0.9 μs/step. Economy models achieve minimum 0.4 μs/step, while high-end models (80S/200S/300S/1000S) reach 0.2 μs/step using dedicated algorithm processors
- Program Capacity: Economy models offer 2K steps; high-end models like MK1000S support up to 10K steps
- Special Functions: Built-in 32-bit symbolic high-speed counters (1-phase: 100kpps ×2 + 20kpps ×2; 2-phase: 50kpps ×1 + 10kpps ×1). Standard models include PID control with relay and PRC self-tuning, plus position control functions
- Built-in communication ports: RS232C, RS485, and programming port
- Supports mainstream industrial protocols including Profibus-DP, DeviceNet, Modbus, and Rnet
- Smart I/O support for P-area expansion (P000-P63F)
- Compatible with KGL-WIN programming software for Windows systems
- Online program editing during operation for convenient maintenance
- Comprehensive self-diagnostic functions with detailed error codes
- Multiple debugging methods including command-based execution and breakpoint operation
| Product Type | Series/Sub-model | Specific Model | Core Specifications | Key Features | Suitable Applications |
|---|---|---|---|---|---|
| All-in-one Module | MASTER-K 10S1 (Economy) | K7M-DR10UE | DC24V, 6 DI / 4 relay outputs | 2K steps, 1 programming + 1 RS485C port | Basic control of small assembly lines |
| MASTER-K 10S1 (Economy) | K7M-DR14UE | DC24V, 8 DI / 6 relay outputs | Expanded I/O points | Small packaging machinery | |
| MASTER-K 120S (Economy) | K7M-DR20UE | DC24V, 12 DI / 8 relay outputs | Expandable to 70 I/O, 0.4μs/step | Small-medium conveyor lines | |
| MASTER-K 120S (Economy) | K7M-DR30UE | DC24V, 18 DI / 12 relay outputs | Higher I/O density | Warehousing sorting equipment | |
| MASTER-K 120S (Standard) | K7M-DR20U | DC24V, 12 DI / 8 relay outputs | Expandable to 120 I/O, 0.1μs/step, PID | Precision assembly lines | |
| MASTER-K 120S (Standard) | K7M-DR30U | DC24V, 18 DI / 12 relay outputs | Increased I/O points | Beverage filling lines | |
| MASTER-K 120S (Standard) | K7M-DR40U | DC24V, 24 DI / 16 relay outputs | 32-bit high-speed counter, pulse output | Electronic component processing | |
| MASTER-K 120S (Standard) | K7M-DR60U | DC24V, 36 DI / 24 relay outputs | RS232C/RS485, Modbus compatible | Automotive parts production | |
| MASTER-K 80S | K7M-DR10S | DC24V, 6 DI / 4 relay outputs | 0.2μs/step, 32-bit high-speed counter | Precision testing equipment | |
| MASTER-K 80S | K7M-DT60S | DC24V, 36 DI / 24 transistor outputs | Profibus-DP support, large capacity | Semiconductor packaging | |
| Modular Unit | MASTER-K 200S (MK200S) | - | 14-256 I/O points | DeviceNet/Modbus, flexible expansion | Automotive production lines |
| MASTER-K 300S (MK300S) | - | 14-512 I/O points | Profibus-DP, multi-CPU coordination | Chemical production lines | |
| MASTER-K 1000S (MK1000S) | - | 14-1024 I/O points | Rnet/Fieldbus, massive expansion | Vehicle assembly lines |
Recommended Models: MK300S, K7M-DR60U
Used in automotive seat accessory production lines for welding, stamping, and assembly station control. Provides precise robotic arm positioning and real-time workpiece rotation monitoring.
Recommended Models: K7M-DRT60U, MK200S
Ideal for beer filling plants and snack food packaging lines. Mixed output modules control conveyor belts and filling valves while maintaining stable operation in high-humidity environments.
Recommended Models: K7M-DR30UE, MK1000S
Controls sorting belt conveyors and automated storage/retrieval systems. Compact design saves space while supporting massive I/O expansion for large-scale logistics operations.
Recommended Models: K7M-DR10UE, MK200S
Manages central air conditioning systems and elevator leveling control. Low power consumption meets building energy-saving requirements with reliable performance.
Recommended Models: K7M-DT60S, MK300S
Controls loom warp beam feeding and printing production lines. High-speed processing and anti-electromagnetic interference design ensure reliable operation in motor-intensive environments.
Most likely caused by mismatched serial cable type or incorrect communication parameters.
Parameter Matching: Set baud rate to default 19200 in both software and device manager
Start with power supply and wiring checks:
- Verify voltage compatibility (most models support DC24V or AC85-264V)
- Check polarity reversal on L/N connections
- Inspect fuse and external load for short circuits
Operating temperature range is 0-55°C. Solutions for high-temperature environments:
- Install industrial air conditioner or cooling fan in control cabinet
- Maintain 50mm ventilation space around PLC
- Use IP65 models or desiccant packs for high-humidity areas
Troubleshoot in this order:
- Verify correct slot position for special function modules
- Check I/O address limits haven't been exceeded
- Ensure host and expansion modules share same power supply switch
First rule out electromagnetic interference:
- Proper grounding with resistance less than 4Ω
- Use shielded cables for analog signals
- Install power supply filtering for high-frequency devices
Focus on these three checks:
- Verify communication protocol matches slave devices
- Check RS485 A/B line connections and terminal resistors
- Ensure communication distance within 1200m limit
Caused by improper load matching:
- Use external relays/SSRs with capacity twice the load current
- Install protective components (freewheeling diodes or RC snubbers)
- Switch to transistor outputs for high-frequency applications
18-month overseas warranty excludes:
- Improper installation/operation (wrong voltage, cable type)
- Damage from external devices or load short circuits
- Environmental factors (corrosion, natural disasters)
- Unauthorized disassembly of PLC casing
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