Description
General Description:
- Model: SM 1221 DI 8×24 V DC
- Type: Digital input module, with 8 inputs for 24V DC signals.
- Input Type: Can be configured for both sinking and sourcing input types (common input configurations for PLC systems).
- Power Consumption: 1.5W
- Dimensions (WxHxD): 45 mm x 100 mm x 75 mm
- Power Supply Current (SM bus): 105mA
- Sensor Power Current (24V): 4mA for each input point used
Electrical Specifications:
- Input Points: 8 digital input channels.
- Rated Voltage (for input points): 24V DC with a 4mA current draw.
- Maximum Continuous Allowable Voltage: 30V DC
- Surge Voltage (Maximum): 35V DC (lasting 0.5 seconds)
- Logic Signals:
- Logic 1 (Minimum): 2.5mA, 15V DC
- Logic 0 (Maximum): 1mA, 5V DC
Isolation and Protection:
- Photoelectric Isolation (between field and logic side): 500V AC for 1 minute.
- Isolation Group: Group 2 (refers to the isolation between different electrical parts to avoid interference).
Signal Filtering:
- Optional filtering time settings for input signal smoothing:
- 0.2 ms, 0.4 ms, 0.8 ms, 1.6 ms, 3.2 ms, 6.4 ms, 12.8 ms
- (Note: 4 inputs are grouped together for each filter time setting)
