Honeywell 900G04-0101 AC/DC Input 16-Channel Module

Honeywell 900G04-0101 AC/DC Digital Input Module

The Honeywell 900G04-0101 module accepts high-voltage discrete signals directly from field devices. You can connect it to AC sources like 120V or 240V. You can also connect it to DC sources up to 125V. This flexibility makes the unit ideal for mixed voltage environments.

The module features sixteen individually isolated inputs. Each input circuit uses two dedicated terminals. Therefore, you do not share commons between channels. This design eliminates ground loop problems significantly.

Key Technical Specifications for AC Application

For AC applications, the 900G04-0101 accepts an input voltage range from 80 VAC to 264 VAC. The peak voltage reaches 264 VAC. Frequency support spans from 47 Hz to 63 Hz. The ON voltage level sits at 75 VAC. Meanwhile, the OFF voltage level is 20 VAC.

Input impedance measures 48 k ohms nominal. Input current is 1 mA typical at 120VAC/60Hz. Furthermore, it becomes 2 mA typical at 240VAC/50Hz. The minimum ON current is only 0.3 mA. The maximum OFF current stays at 0.2 mA. These low values ensure reliable detection.

Key Technical Specifications for DC Application

For DC applications, the 900G04-0101 accepts 80 VDC to 125 VDC. The peak voltage limit is 150 VDC. The ON voltage level requires 75 VDC. The OFF voltage level is 30 VDC. Input impedance remains 48 k ohms nominal.

Input current measures 2 mA typical at 125 VDC. Similar to AC mode, the minimum ON current is 0.3 mA. The maximum OFF current is 0.2 mA. This consistency simplifies troubleshooting across different field signals.

Galvanic Isolation and Safety

The module provides galvanic isolation between input-to-input and input-to-chassis. The maximum isolation rating reaches 350 VAC. This protection shields the controller backplane from high-voltage surges. Additionally, it prevents cross-channel interference. You can safely mix different voltage sources on the same module.

Response Times

Speed characteristics vary slightly between AC and DC modes. For AC applications, the OFF to ON response time is 6 ms + 1.5 line cycles maximum. The ON to OFF response time is 6 ms + 2 line cycles maximum.

For DC applications, the OFF to ON response time is 6 ms + 2 line cycles maximum. The ON to OFF response time is the same at 6 ms + 2 line cycles maximum. Please remember these times exclude the controller's scan time. They also exclude the transmission time to the backplane.

Status Indicators and Diagnostics

Each channel has a dedicated green LED. This LED turns ON when the input detects an active signal. A green blinking status LED confirms the module is being scanned by the processor. Moreover, a red status LED illuminates when module diagnostics detect a fault. Logic inside the controller also allows you to invert the input state when necessary.

Mechanical and Installation Requirements

• Operating Temperature: 0 to 60 °C (32 to 140 °F)

• Storage Temperature: -40 to 85 °C (-40 to 185 °F)

• Relative Humidity: 5% to 95% (Non-condensing)

• Mounting: Directly onto Honeywell PMC chassis

• Terminal Block Requirement: Euro-style 36-terminal terminal block (ordered separately)

• Field Power: External power source required (module does not supply field power)

FAQ

1. Does the 900G04-0101 supply power to my field devices?
No. This module requires an external power source. You must apply 80-264 VAC or 80-125 VDC from an external supply to the input terminals.

2. Can I mix AC and DC signals on the same module?
Yes. Each channel is individually isolated. You can connect some channels to 120VAC and others to 125VDC on the same 900G04-0101 module.

3. What terminal block does this module need?
It requires a Euro-style 36-terminal terminal block. This block is not included with the module. Please purchase it separately.

4. Why does my input stay ON even with no voltage applied?
Check the OFF voltage level specification. For DC applications, voltage below 30 VDC should turn the input OFF. For AC, voltage below 20 VAC should turn it OFF. Any residual voltage above these thresholds keeps the input ON.

5. How do I interpret the red status LED?
A red LED indicates a module diagnostic condition. Check your controller's fault log. If the error persists, you may need to replace the 900G04-0101 module.