Remote I/O Processors, Schneider Electric 800 Series

Configured for remote I/O processing on S908/CRP networks, the Schneider Electric AS-P890-300 (AS-P890-300 Remote I/O Processor) provides physical interface and data exchange between 800 Series I/O modules and the remote I/O network. It supports selectable 115/230 VAC or 24 VDC power input, two half-duplex ASCII interfaces, and single or redundant 75-ohm coaxial remote I/O cabling.

Hardware Specifications

Parameter	Specification
Model	AS-P890-300
Brand	Schneider Electric
Product Line	800 Series
Product Type	Remote I/O Processor
Weight	4.00 lb
Operating Temp	0 deg C to 60 deg C
Storage Temp	-40 deg C to 85 deg C
Power Supply	115/230 VAC or 24 VDC, independently switched
Maximum Load	7 A
Power Consumption	115 VAC: 1.1 A; 230 VAC: 0.65 A; 24 VDC: 4 A
Inrush Current	30 A at 115 VAC; 25 A at 24 VDC
I/O Compatibility	S908/CRP networks and 800 Series I/O modules
I/O Capacity	Up to 2048 points: 1024 inputs and 1024 outputs
Communication Ports	Two half-duplex ASCII interfaces
Remote I/O Cabling	75-ohm coaxial, single or redundant
Communication Rate	1.544 MHz
I/O Scan Time	Under 5 ms for 256 points
Drop Hold-up Time	Adjustable from 300 ms to 6553.6 seconds in 100 ms steps
Certifications	UL 508; CSA 22.2-142; CE receiver module

S908/CRP Remote I/O Network Characteristics

The AS-P890-300 operates as a remote I/O processor for the Schneider Electric 800 Series architecture. The remote I/O physical layer uses 75-ohm coaxial cabling and supports either single or redundant cabling arrangements. The processor provides two half-duplex ASCII communication interfaces and operates at a stated communication rate of 1.544 MHz.

The processor supports up to 2048 I/O points, divided into a maximum of 1024 input points and 1024 output points. The specified scan performance is under 5 ms for a 256-point I/O configuration. The adjustable drop hold-up interval ranges from 300 ms to 6553.6 seconds in 100 ms increments.

Frequently Asked Questions

Q: What power sources can the AS-P890-300 accept?

A: The processor supports 115/230 VAC or 24 VDC power supplies. The supplied data specifies independent switching and a maximum load of 7 A.

Q: What remote I/O cable interface is specified for the processor?

A: The AS-P890-300 uses 75-ohm coaxial remote I/O cabling. The supplied specifications permit either single or redundant cabling configurations.

Q: What I/O capacity is supported?

A: The processor supports up to 2048 points, consisting of up to 1024 input points and 1024 output points.

Field Installation Guidelines

Install the AS-P890-300 according to the applicable Schneider Electric 800 Series hardware documentation and the electrical requirements of the host installation.

Verify the selected power source before energizing the processor. The 115/230 VAC and 24 VDC supply options should be wired according to the applicable terminal identification and system configuration.

Use 75-ohm coaxial cable for the specified remote I/O network connections. Maintain appropriate cable routing and separation from high-current or high-noise power conductors to reduce electromagnetic coupling.

For redundant remote I/O cabling, route the two network paths separately where the installation permits. Avoid unnecessary cable loops, sharp bends, or routing conditions that can introduce mechanical stress or signal degradation.

Terminate cable shields and protective conductors according to the system grounding design. Avoid creating unintended ground loops through multiple shield termination points unless required by the installation standard.

Before commissioning, verify the processor power input, network cabling, I/O addressing, communication interfaces, and connected 800 Series I/O modules. The supplied source contains conflicting weight values of 4.00 lb (1.81 kg) and 2.94 lb; physical identification should therefore be confirmed against the actual hardware documentation before mechanical installation.

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