Description
Honeywell CC-PAIH51
Technical Specifications 16 single-ended 4-20mA input channels; exclusive support for two-wire loop-powered HART transmitters; A/D conversion resolution 16 bits; signal full-scale accuracy ±0.075%; backplane 24VDC power supply; operating temperature 0℃~60℃; storage temperature -40℃~85℃; humidity 5%~95% non-condensing; channel-to-backplane galvanic isolation; support open wire, short circuit and overload fault diagnosis; HART 7 protocol.
Functional Features It supplies limited non-incendive working power to field two-wire transmitters. It reads multi-variable data and equipment diagnostic information of HART instruments. It detects the state of current loop in real time and generates bad process variable alarm when the line is broken. It supports hot swap and can form redundant system with CC-TAIX61 redundant IOTA. The module has built-in power limiting circuit to prevent transmitter damage caused by short circuit.
Application Scenarios Centralized acquisition of a large number of 4-20mA HART pressure and flow transmitters in oil refining plants; field instrument signal collection of offshore platform process control system; temperature and pressure monitoring of chemical hazardous material storage tanks; continuous measurement of pulp and paper process parameters; fire and gas system analog detector signal acquisition.
Performance Parameters CMRR is 70dB DC to 60Hz; NMRR at 60Hz is 19dB; single channel loop power supply has current limiting function; the response speed of wire break diagnosis is less than 100ms; the HART communication signal will not cause the fluctuation of 4-20mA primary signal.
Material Composition FR4 multi-layer flame retardant PCB with G3 anti-corrosion conformal coating. Gold-plated backplane connector. Flame retardant PC front panel. Each channel is equipped with independent HART modem and current limiting circuit. High precision metal film resistor is used for current sampling.
Structural Characteristics Single-slot vertical rack card of Series C. Front panel with power, run, HART communication and channel fault indicator lights. Elastic lock buckles on both sides. Fool-proof structure, only match TAIX51/TAIX61 special IOTA base. Passive heat dissipation without fan.
Working Principle The two-wire HART transmitter is connected to CC-TAIX51 non-redundant IOTA or CC-TAIX61 redundant IOTA. The IOTA transmits the 4-20mA current signal and provides the loop power supplied by CC-PAIH51. The module samples the current signal and converts it into digital engineering value. The superimposed HART digital signal is demodulated by the built-in modem. The measurement data and fault diagnosis information are transmitted to C300 controller through the Series C backplane bus.
Installation Requirements Vertical installation in Series C I/O rack, matched with dedicated TAIX51 or TAIX61 termination base. Field transmitter cables use shielded twisted pair, single-point grounding in cabinet. Instrument cables are separated from power cables. Cabinet grounding resistance ≤4Ω. In hazardous area application, confirm the non-incendive parameter matching of the whole loop.
Usage Notes Voltage signal cannot be connected to the channel. When the transmitter is replaced, the power supply of the loop shall be cut off. The HART configuration software shall be used to read instrument information through the module. Do not modify the current limiting parameters of the module without authorization.
