MTL Instruments|8123-PL-QU| Isolated Discrete Input Module
MTL 8123-PL-QU Isolated Discrete Input Module
Description
MTL 8123-PL-QU isolated sinking discrete input module for 24 V dc field signals, featuring user-defined thresholds and pulse counting.
Features
- 8 isolated sinking inputs
- Compatible with 24 V dc field sources
- User-definable input filter and latch
- Pulse counting capability
- Bussed field power not required
Technical Specifications
- Channels: 8
- Input Type: Isolated, sinking
-
Voltage Levels:
- OFF: < 3.2 V dc
- ON: > 11 V dc
- Max Input: 30 V dc
- Reverse Input: –25 V dc
- Wetting Current: 6.3 mA (nominal @ 24 V dc)
-
Pulse Detection:
- Minimum Pulse Width: 3 ms
- Max Frequency (no-filter): 200 Hz
- Response Time: ≤ 3 ms (field event to Railbus)
-
Isolation:
- Channel to Railbus: 250 V ac (typ.)
-
Configurable Settings:
- Input Filter: Fast, slow, or user-defined (0–512 ms in 2 ms steps)
- Latch: Enable/Disable, polarity selectable
- Pulse Counting: Enable/Disable
-
Safety (FM Non-incendive):
- Vmax = 30 V, Imax = 100 mA
- Ci = 0 μF, Li = 0 mH (per channel)
-
Power Requirements:
- Railbus (12 V): 35 mA (typ.), 55 mA (max.)
- Bussed Field Power: Not required
-
Mechanical:
- Module Width: 42 mm
- Weight: 170 g
- Key Code: B2
MTL Instruments|8123-PL-QU| Isolated Discrete Input Module

MTL Instruments|8123-PL-QU| Isolated Discrete Input Module
MTL 8123-PL-QU Isolated Discrete Input Module
Description
MTL 8123-PL-QU isolated sinking discrete input module for 24 V dc field signals, featuring user-defined thresholds and pulse counting.
Features
- 8 isolated sinking inputs
- Compatible with 24 V dc field sources
- User-definable input filter and latch
- Pulse counting capability
- Bussed field power not required
Technical Specifications
- Channels: 8
- Input Type: Isolated, sinking
-
Voltage Levels:
- OFF: < 3.2 V dc
- ON: > 11 V dc
- Max Input: 30 V dc
- Reverse Input: –25 V dc
- Wetting Current: 6.3 mA (nominal @ 24 V dc)
-
Pulse Detection:
- Minimum Pulse Width: 3 ms
- Max Frequency (no-filter): 200 Hz
- Response Time: ≤ 3 ms (field event to Railbus)
-
Isolation:
- Channel to Railbus: 250 V ac (typ.)
-
Configurable Settings:
- Input Filter: Fast, slow, or user-defined (0–512 ms in 2 ms steps)
- Latch: Enable/Disable, polarity selectable
- Pulse Counting: Enable/Disable
-
Safety (FM Non-incendive):
- Vmax = 30 V, Imax = 100 mA
- Ci = 0 μF, Li = 0 mH (per channel)
-
Power Requirements:
- Railbus (12 V): 35 mA (typ.), 55 mA (max.)
- Bussed Field Power: Not required
-
Mechanical:
- Module Width: 42 mm
- Weight: 170 g
- Key Code: B2