RELIANCE 61C346 remote I/O bus master adapter card
61C346 is a remote I/O bus master adapter card of Reliance AutoMax 61C series control platform, designed to serve as communication interface between main rack backplane and off-board distributed field I/O rails. It transmits control commands from CPU to field I/O modules and collects field digital and analog feedback signals for upper controller processing. Original factory production has been discontinued, and available market goods include unused original surplus stock and fully tested refurbished products for maintenance and upgrade of legacy papermaking, metallurgy and textile automation control cabinets.
Description
Product Introduction
61C346 is a remote I/O bus master adapter card of Reliance AutoMax 61C series control platform, designed to serve as communication interface between main rack backplane and off-board distributed field I/O rails. It transmits control commands from CPU to field I/O modules and collects field digital and analog feedback signals for upper controller processing. Original factory production has been discontinued, and available market goods include unused original surplus stock and fully tested refurbished products for maintenance and upgrade of legacy papermaking, metallurgy and textile automation control cabinets.
Model Definition
61C is the unified series identifier for Reliance AutoMax remote I/O adapter product line. Numerical code 346 specifies fixed internal communication protocol parameters, terminal layout and power circuit configuration unique to this model. It differs from 61C-345-A in bus driving capability and external rail load specifications while sharing the same standard rack mounting dimension.
Technical Specifications
Rated input operating power supports 115VAC and 230VAC options at 50/60Hz with maximum input current of 0.65A. Internal circuit is equipped with built-in overcurrent protection fuse for field rail power loop. Continuous operating ambient temperature ranges from -20℃ to +60℃, storage temperature is -40℃ to +85℃, and working relative humidity keeps 5%~95% without condensation. The card follows single-width AutoMax standard plug-in dimension and passes original factory high voltage insulation withstand testing.
Interface and Communication Configuration
Special multi-core terminal connectors on front panel are used for external field I/O rail bus and power wiring. Rear golden finger connector plugs into AutoMax main rack slot to realize bidirectional data exchange with system CPU via proprietary AutoMax backplane bus protocol. Multiple LED indicators on front face separately show power status, normal communication operation and field rail fault alarm. No default onboard Modbus or RS485 universal communication port is equipped.
Core Functions
Convert internal rack backplane bus signals into dedicated field remote rail bus signals to deliver control instructions issued by main CPU to distributed field I/O modules. Periodically gather all DI/DO and analog data from connected remote I/O rails and upload integrated information back to upper control unit. Continuously monitor power supply and communication link status of each attached field rail, activate fault indicator and send abnormal warning signal to CPU in case of overload, short circuit or communication dropout. Internal isolation circuit blocks abnormal voltage surge from field side to protect core components inside main control rack.
Application Scenarios
Compatible with full series of Reliance AutoMate field I/O modules for decentralized automation system layout. Widely applied in field signal acquisition for auxiliary interlock equipment on papermaking machines, limit signal monitoring of metallurgical conveyor lines, scattered I/O control of textile production lines, and spare replacement for obsolete printing and packaging machinery original control systems.
Operation and Maintenance Instructions
Cut off overall AC power of control rack and wait more than 20 minutes for complete residual charge release of internal capacitors before module removal or installation. Complete quarterly routine maintenance to check terminal wiring tightness and pin oxidation, and clear internal dust with dry low-pressure compressed air. Prevent long-term overloaded connection of field I/O rails exceeding rated load limit. When field rail communication or power failure happens, inspect external wiring and peripheral I/O modules first; replace the entire 61C346 module only after all peripheral defects are excluded.
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