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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.
SC-4 security expansion module | |
 | · Is a safety relay output expansion module. · Receive the on-site safety switch signal, and expand it into 4 NO (normally open) safety output contacts and 2 NC (normally closed) auxiliary output contacts. |
| ▊ | Product selection  |
product name | model | Safety input | Safe output | order number |
SC-4 | 24V DC | Safety switch, contact switch | 4NO+2NC | LHS |
| explain | Safety switch, contact switch | |||
| ▊ | 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 | 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: -15%~+10% ·Current loss: ≤70mA(24VDC) |
Input characteristics | ·Input current: ≤70mA(24VDC) ·Conductor resistance: ≤15Ω ·Input equipment: safety switch, contact switch. |
| output characteristic | ·Number of contacts: 4NO+2NC Safety outputs: 13, 14, 23, 24, 33, 34, 43, 44. Auxiliary outputs: 11, 12 (status) Y1, Y2 (feedback) ·Contact material: AgSnO2+0.2 μm Au. ·Contact type: forced guidance ·Contact fuse protection: 10A gL/gG, NEOZED (normally open contact) 6A gL/gG, NEOZED (normally closed contact) ·Switching capacity (en 60947-5-1): AC-15, 5a/230v; DC-13, 5A/24V ·Mechanical life: more than 107 times |
Time characteristic | ·Suction buffer time: ≤30ms ·Release buffer time: ≤20ms ·Recovery time: ≤1000ms ·Short interruption of power supply: 20ms |
| ▊ | 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% ·Electrical clearance and creepage distance: in accordance with EN60947-1. ·Overvoltage grade: Ⅲ ·Pollution level: 2 ·Altitude: ≤2000m ·Rated isolation voltage: 250VAC. ·Rated impulse voltage: 6000V(1.2/50us) ·Insulation strength: 1500VAC for 1min. |  |
| ▊ | Functional application parameters |
functional block diagram | Typical application |
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▊Overall dimensions (depth× height× width):
Overall dimensions (depth× height× width):114.5mm×99.0mm×22.5mm Net weight of product200g |  |
| ▊ | Wiring diagram |
Power supply/input loop | Switch input |
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Output loop |  |
feedback loop |  |
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)
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