As the most important part of safety loop, safety controller/safety PLC has been recognized by more and more people, but in the process of use, there are still many users who are confused about the differences between safety relay and ordinary relay, so I would like to share them with you here. As we all know, we must remember three words in the concept of safety design:
(1) Redundancy
(2) Difference
(3) Self-detection
How to construct the safety loop with the reliability above PLd, the safety controller must become an important link. The safety loop consists of safety input, safety control and safety output subsystems, and the safety control "including safety relay, safety controller, safety PLC, etc." realizes the safety control function. Designers match different safety controllers to achieve the reliability level of the safety loop according to the number of products at the input end.
| ▊ SM-302 programmable safety controller | |
 | · Is a configurable safety controller, which supports the input of various safety product components. ·Maximum support for 3 sets of dual-loop inputs. ·Iso 13849-1 performance index PLe ·Built-in self-diagnosis function for fault detection ·Modbus protocol communication ·Input and output fault indicator light ·Safety certification: PL e, Cat: 4 |
| ▊ | Product selection |
product name | model | Safety input | Safe output | brand |
Programmable safety controller | SM-302 | 3CH | 2NO | LHS |
| explain | Up to 3 sets of dual-channel security products can be entered. The programming software defines the field safety products by itself. Official website programming software download connection.：http://lhsafety.com.cn/showinfo-257-118-0.html | |||
| ▊ | safety performance |
·Performance level (PL): PLE ·Safety category (cat.): cat.4. ·Task time (TM): 20 years. ·Diagnostic coverage (DC/DC AVG): 99% ·Safety integrity level (SIL): SIL3 ·Hardware fault margin (HFT): 1 ·Safety Failure Score (SFF): 99% ·PFHD: 1.78e-9/h ·Stop category: 0/1 | Comply with the standard EN ISO13849 Comply with the standard EN ISO13849 Comply with the standard EN ISO13849 Comply with the standard EN ISO13849 Comply with standards IEC61508, IEC62061. Comply with standards IEC61508, IEC62061. Comply with standards IEC61508, IEC62061. Comply with standards IEC61508, IEC62061. Comply with standard EN 60204-1. |
| ▊ | Main technical parameters |
Power supply characteristics | ·Power supply voltage: 24VDC ·Voltage range: 20~30VDC ·Current loss: ≤100mA(24VDC) |
Input characteristics | ·Input current: ≤10mA(24VDC) ·Conductor resistance: ≤15Ω ·Input equipment: emergency stop button, safety door, two-hand button, ·Safety light curtain, magnetic switch, etc ·Input channel: 3 |
| output characteristic | ·Number of contacts: 2NO (safety output) ·Contact material: AgSnO2 ·Contact fuse protection: 10A is fast, 6A is slow. ·Switching capacity: 5A/230VAC；; 5A/24VDC |
Time characteristic | ·Suction buffer time：≤100ms ·Release buffer time：≤30ms ·Recovery time: Emergency stop operation：≤30ms Power failure：≤1000ms ·Recovery time: Emergency stop operation：≤30ms Power failure：≤100ms ·Short-term interruption of power supply：20ms |
Communication characteristics | ·Baud rate: 38.4kbps (fixed) ·Communication length: ≤1000m ·Networking capacity: ≤10 units |
| ▊ | Environmental characteristic parameters |
·Electromagnetic compatibility: comply with EN60947, EN61000-6-2 and EN61000-6-4. ·Vibration frequency: 10Hz~55Hz ·Vibration amplitude: 0.35mm ·Operating temperature: -20℃~+60℃ ·Storage temperature: -40℃~+85℃ ·Relative humidity: 10%~90% ·Overvoltage grade: Ⅲ ·Pollution level: 2 ·Altitude: ≤2000m ·Rated isolation voltage: 250VAC. ·Rated impulse voltage: 6000V(1.2/50us) ·Insulation strength: 1500VAC for 1min. ·Electrical clearance and creepage distance: in accordance with EN60947-1. | |
| ▊ | Functional application parameters |
functional block diagram | Typical application |
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Input element: CH1 (emergency stop button); CH2 (emergency stop button); CH3 (reset button) Control Logic: CH1&CH2 Reset mode: manual reset. Output delay: 0s Safety level: Cat.4 performance level: PLe safety integrity level: SIL 3 |
| ▊ | Wiring diagram |
Power Supply |
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input |  |  |  |
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reset |  |  | |
feedback |  |  | |
output |  |
Lihong Safety Equipment Engineering (Shanghai) Co., Ltd.
E-Mail: info@lh-safety.com
Address: 581 Xiuchuan Road, Chuansha Town, Pudong New District, Shanghai
(Greenland East Coast International Plaza-Room A 313)
Copyright ? Lihong Safety Equipment Engineering (Shanghai) Co., Ltd. ICP19034341-1 Technical Support: lanjujing
