Ovation Westinghouse 1C31227G01 analog input module

Description

In addition, 1C31227G01 all modules utilizing the auxiliary power supplies, including the HART

modules, MUST utilize shielded I/O cables in order to suppress coupled noise and

transients into the HART modules. This includes modules on the same branch

utilizing the auxiliary power, or modules on other 1C31227G01 branches utilizing the same

auxiliary power. This recommendation applies regardless of the type of power

supply chosen by the user.

Number of channels 8

Input range 4 to 20 mA normal operation

0 to 23 mA with under-range and over-range levels user selected

and Controller monitored.

A/D Resolution 16 bits

Reference accuracy (@ 25oC) +/-0.05% of span @ 99.7% confifidence

Accuracy over temperature +/-0.1% of span over the full operating temperature range

Sampling rate (per ms) Each channel is sampled every 24 ms.

Dielectric 1C31227G01 isolation:

Channel to channel

Channel to logic

No channel to channel isolation

1000 VAC/VDC for one minute

Operating temperature range 0o to 60o C. (32o F to 140o F)

Humidity (non-condensing) 0% to 95%

Module power Main: 1.2W typical. 2.5W maximum

Aux. power supply voltage = 24 VDC -5%, +6.25%

Aux: 4.1W typical. 7.2W maximum

Two-wire transmitter power 13.5V minimum (Pn+ to An+) @ 20 mA

where n = 1 to 8

(current limited to 32 mA maximum)

Each Personality module has 1C31227G01 a simplifified wiring diagram label on its side which

appears above the terminal block. This diagram indicates how the wiring from the

fifield is to be connected to the 1C31227G01 terminal block in the base unit.

The diagrams for the HART Analog Input Personality modules are illustrated in

Figure 13-4. The following table lists and defifines the abbreviations used in those

diagrams.

Field I/O cable must be one or more single-twisted pair shielded or multiple-twisted

pair with overall shield. Single and multiple pair may be combined provided that all

of the shields share a common connection to earth ground in the Ovation cabinet.

The maximum length of cable per HART network is dependent on the

characteristics of the devices connected to the network and the characteristics of the

cable to be used.

In a HART network, long cable lengths are 1C31227G01 possible when the dominant low

impedance device (the HART Analog Input module) has an input impedance of

approximately 250 ohms. Low capacitance good-quality cable is used, and the

Smart transmitter (high impedance device) has a low input capacitance (less than

5000 pF) and a high input resistance (grater than 100 K ohm).

Example: Cable Length Calculation

Single Smart Transmitter, parallel network resistance = 250 ohm

(HART Analog Input module input impedance)

Smart Transmitter Capacitance: 5000 pF

Cable Capacitance (Cx): 50 pF/ft.

Cable Resistance (Rx): 0.016 ohm/ft. (22 AWG)

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