The Honeywell 8U-TPOXA1, also cataloged as the 8U-TPOXA1 Profibus Gateway Module, operates as a dedicated hardware component for fieldbus network integration and multi-device telemetry routing within Honeywell Series 8 I/O platforms. Configured to interface up to 127 Profibus DP field devices across deterministic industrial networks, the module provides direct electrical signal conversion and high-speed data execution, converting 100-240 VAC primary input power into isolated 24 VDC bus output.
Hardware Specifications
Parameter
Specification
Model
8U-TPOXA1
Brand
Honeywell
Origin
USA
Weight
0.7 kg
Dimensions
125 mm x 100 mm x 75 mm
Operating Temp
-20 to +60 deg C
Storage Temp
-40 to +85 deg C
Relative Humidity
0% to 95% non-condensing
Input Voltage
100-240 VAC, 50/60 Hz
Output Voltage
24 VDC +/- 2 %
Capacity
Up to 127 Profibus DP Devices
System Architecture
Honeywell Series 8 I/O System
Profibus PA Connectivity and Channel-to-Channel Isolation
The 8U-TPOXA1 gateway incorporates internal galvanic channel-to-channel isolation and differential noise-suppression networks to manage high-speed Profibus DP and Profibus PA cyclic data exchanges. By isolating the internal 24 VDC output bus from incoming 100-240 VAC line fluctuations, the module prevents ground potential shifts and high-frequency noise from destabilizing field communication frames. Integrated bus arbitration logic maintains real-time parameter exchange across all 127 connected slave nodes without frame dropouts or signal degradation.
Frequently Asked Questions
Q: What is the maximum number of Profibus DP slave nodes supported by a single 8U-TPOXA1 gateway module?
A: A single 8U-TPOXA1 module supports deterministic address assignment and communication indexing for up to 127 Profibus DP field devices across the network segment.
Q: How does the module maintain output voltage stability under varying AC line inputs?
A: The onboard wide-range power converter accepts 100-240 VAC input at 50/60 Hz and regulates a continuous 24 VDC (+/- 2 %) auxiliary output, isolating downstream field communication logic from AC line transients.
Field Installation Guidelines
Secure the 8U-TPOXA1 module into its designated Series 8 carrier chassis slot, verifying that top and bottom retention latches engage fully to ensure proper backplane connection.
Route Profibus DP RS-485 shielded twisted-pair cabling through separate wire channels, maintaining at least 30 cm distance from high-voltage AC lines.
Terminate the Profibus network cable shield drain directly to the cabinet instrument ground bar (Clean Ground) at a single grounding point to maintain isolation integrity.
Verify that active RS-485 bus line terminators are properly set to ON at both physical endpoints of the Profibus DP trunk line to avoid signal reflections.
