The Honeywell 900B01-0301 delivers four fully isolated current outputs. Each channel operates within a 0 to 21.8 mA range. You can scale any span on a per-output basis. This flexibility makes it suitable for valve positioning, actuator control, and variable frequency drives.
Outputs update synchronously with the IOM scan time. The minimum scan time reaches 500 ms. A green blinking LED indicates normal scanning activity. Meanwhile, a red LED alerts you to module or channel diagnostics. The module also supports a user-specified failsafe value. Therefore, predictable operation continues even if communication with the controller stops.
Additionally, the 900B01-0301 includes output verification feedback. This feature confirms actual output current flowing to the field device. For instance, you can detect open circuits or wiring issues immediately.
Each of the four outputs provides galvanic isolation. Channel-to-channel isolation is 500 VDC. Isolation from logic circuits reaches 600 VDC. Maximum load resistance is 750 ohms. Accuracy stays within 0.1% of full scale under reference conditions.
The D/A resolution is 12 bits. Minimum current sensing per output exceeds 3.5 mA. You can install up to 10 modules per rack under normal conditions. Furthermore, up to 12 modules are possible with ambient temperature derating.
Calibration data resides in non-volatile memory. Redundant factory calibration includes automatic rejection of bad versions. Diagnostics monitor factory calibration, user configuration, and the +24 VDC power supply.
The Honeywell 900B01-0301 gives you two failsafe options. First, you can choose Hold Last Value. Second, you can define a specific Failsafe Value. These choices ensure the module behaves safely during communication loss.
A user-specified scan rate is supported through the slew rate function block. The slew rate defines the maximum speed from full OFF (0% or typically 0 mA) to full ON (100% or typically 20 mA). The block converts this into a maximum milliamp change per execution cycle. Consequently, you avoid sudden jumps that could damage actuators.
Operating temperature ranges from 0°C to 60°C. Storage temperature goes from -40°C to 85°C. Humidity tolerance is 5% to 95% non-condensing. The module withstands vibration up to 2g at 10–500 Hz. Additionally, shock resistance is 30g for 11 ms half-sine.
Power consumption is typically 2 W from the backplane plus field loop power. The module has a compact design for high-density installations.
First, disconnect backplane power before inserting the 900B01-0301. Next, align the module with the chassis guide rails. Push it gently until the latch engages. Then, connect field wiring to the removable terminal block.
For current loops, ensure the load resistance does not exceed 750 ohms. Use shielded twisted-pair cables to reduce noise. Finally, configure each channel using the system engineering tool. You can set output range, failsafe behavior, and slew rate individually.
Honeywell 900B01-0301 module – 1 unit
Removable terminal block – 1 piece
Installation guide – 1 copy
Channel label sheet – 1 sheet
We ship via Fedex, UPS, DHL. Delivery times depend on your location. All items are carefully packed in anti-static materials.
1. Can I use the Honeywell 900B01-0301 for 4-20mA loops?
Yes, you can scale any span within 0 to 21.8 mA. Simply configure 4 mA as 0% and 20 mA as 100%.
2. What happens if the controller communication fails?
The module activates the user-selected failsafe state. You can choose Hold Last Value or a specific Failsafe Value.
3. How does output verification feedback work?
The module measures actual output current. It then reports this value back to the controller for confirmation.
4. What is the maximum number of modules per rack?
You can install up to 10 modules normally. With ambient temperature derating, up to 12 modules are allowed.
5. Is field calibration required after installation?
No, redundant factory calibration is stored in non-volatile memory. Automatic rejection of bad versions ensures reliability.
| Brand Name | Honeywell |
| Model No. | 900b01-0301 |
| Product Type | Analog Output Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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