Product Short Description
Product Name: 16-Channel Digital Input Module (PAC8000 I/O System)
Overview:
The GE 8121-DI-DC is a 16-channel digital input (DI) module belonging to GE’s PAC8000 I/O system (MTL Instruments series). It collects discrete on/off signals from field devices such as limit switches, push-buttons, and proximity sensors, and transmits them to the control system over the Railbus.
Description
Technical Specifications:
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Manufacturer: GE (General Electric) – MTL Instruments series
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System: PAC8000 I/O
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Input Channels: 16 (sourcing type)
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Operating Voltage: 18–30 VDC (bus-powered)
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Input Signal Types: NPN, PNP; high-level, low-level, pulse
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ON-state Input Current: > 1.2 mA
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OFF-state Input Current: < 0.3 mA
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Wetting Current: 2.8 mA typical
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Input Filter Time: 2–512 ms selectable (Fast / Slow / Custom)
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Minimum Detectable Pulse Width: 5 ms
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Max. Pulse Counting Frequency: 100 Hz (debounce-off mode)
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Channel-to-Railbus Isolation: 250 VAC
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Field Wiring Safety (per channel): Voc = 30 V, Isc = 3.5 mA, Ca = 0.12 µF, La = 1000 mH
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Bus Power Consumption: 60 mA @ 18–30 VDC (typical)
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Module Width: 42 mm
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Weight: 210 g
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Operating Temperature: -20 °C to +70 °C
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Mounting: PAC8000 Railbus / DIN rail
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Certifications: FM non-intrinsic-safety, CE
Key Features:
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High-density 16-channel design saves control cabinet space
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Auto-compatible NPN/PNP – no reconfiguration needed
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Programmable filter time (2–512 ms) suppresses electromagnetic interference
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Debounce function eliminates false triggering from mechanical switch bounce
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Pulse counting up to 100 Hz
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Railbus isolation of 250 VAC per channel
Application Scenarios:
Chemical, power, metallurgy, and general manufacturing industries; specifically suited for Motor Control Centers (MCC) and high-voltage switchgear where strong EMI is present.
Installation & Notes:
Mount on PAC8000 Railbus or standard DIN rail. Ensure bus field power module (24 VDC) is properly sized. Set filter time according to field noise level (use slow filtering for high-EMI environments). Observe 250 VAC isolation rating when selecting field wiring.
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