Rockwell-automation 61C345 4 Input 4-20mA Analog Rail Module Manual do Utilizador descarregar pdf (Página 14)

2Ć4

+10.000 V

 to A/D

converter

277.778



32mA

(

 250 )

IĆIN

IĆCommon

Figure 2.2 Ć Typical Input Circuit

The Analog Rail module is factory calibrated and requires no

offset/gain adjustment. All four analog input channels are referenced

to the same common. This common is isolated from both the

external power supply and the I/O port connection.

The module incorporates extensive diagnostics. In Rail mode, check

bits are monitored for accuracy on every transfer of data between

the processor and the module. In Local Head mode, parity bits are

monitored for accuracy on every transfer of data. A Rail fault LED on

the processor, Remote Head, or Local Head will be illuminated if the

check bits or parity bits are wrong and all transmission will stop after

n retries, where n is a value determined by the host's software

(averagen=4forAutoMax; AutoMaten=2).

In the event of a rail fault, the COM OK" LED on the module will go

off. If any power required by the module, i.e., the +5 Volts from the

I/O port required for communication, the external power supply, or

the power required by the Analog input section, is not within

specified limits, the PWR OK" LED will go off.

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Rockwell-automation 61C345 4 Input 4-20mA Analog Rail Module Manual do Utilizador Página 14