Honeywell 900SP1-0300 Expansion Processor Module

Honeywell 900SP1-0300 Expansion Processor Module

The 900SP1-0300 is an expansion processor module developed by Honeywell for the Process Automation Controller family. It serves as the primary communications interface between a main HC900 controller and remote I/O racks, routing field inputs and control outputs across distributed rack locations.

System Architecture and Expansion Capability

The module mounts exclusively into the dedicated far-left slot of an HC900 remote I/O rack. Depending on the host controller CPU model (C50, C70, or C75), a single system can support up to 11 remote expansion racks. Dual RJ-45 100Base-T Ethernet ports enable redundant cable topology, providing fault-tolerant communication links up to 100 meters using standard Category 5 twisted-pair cabling.

Power Requirements and Hot Swap Features

Operating on a 5 VDC internal bus supply, the module draws a maximum input current of 520 mA with a total power consumption of approximately 2.6 W. Live insertion and removal (hot swapping) are supported, allowing plant technicians to replace the module during active operation without disrupting field devices connected across other system racks.

Environmental Design and Safety Standards

Engineered for harsh industrial environments, the module features G3-level conformal coating for enhanced resistance against corrosive atmospheric contaminants and moisture. It operates reliably across a temperature range of 0 deg C to 60 deg C (10% to 90% non-condensing relative humidity) and complies with CE mark and EN 61326-1 industrial EMC standards.

Frequently Asked Questions

Q: What is the primary purpose of the Honeywell 900SP1-0300 module? A: It functions as an expansion processor module to connect a central Honeywell HC900 controller CPU to remote I/O racks via Ethernet communication links.

Q: Can the 900SP1-0300 be replaced while the system is powered? A: Yes, the module supports live insertion and removal (hot swapping), allowing replacement under system power without disturbing active control loops on other racks.

Q: How many remote racks can be connected using this module? A: Depending on the main controller model (such as C50, C70, or C75), a single system topology can support up to 11 remote expansion racks.