Micromod MOD: 30ML Functions Data Base Reference Manual do Utilizador descarregar pdf (Página 77)

MOD 30ML Functions

BUILT-IN ANALOG INPUT BLOCK

Input Type (INTYPE)......................................................................................................... C – R

Configuration of this parameter identifies the type of input to which the AIN block applies.

Input types are as follows:

VOLTS 1 Input range is -10 mV to +6V dc.

CURRENT 2 This selection applies to either 2-wire or non 2-wire inputs.

Input range is 0 to 54 mA.

MILLIVOLTS 3 Input range is -10 mV to +120 mV dc .

THERMOCOUPLE 4 When this input type is selected and cold junction

compensation is required, the compensation must be

obtained from an external source. The input range is -10

mV to +120 mV dc

TC + CJC 5 This selection (thermocouple with cold junction

compensation) provides the following:

• For Input 1, cold junction compensation is available from a

temperature sensor that is part of the built-in input circuit.

• For Input 2, the cold junction compensation value can only be

set by the operator because the Cold Junction Compensation

Mode (Attr #40) must be LOCAL for Input 2.

• The thermocouple input range is -10 mV to +120 mV dc.

NOTE: If input 2 is a thermocouple input requiring cold junction

compensation, an Input Type selection of THERMOCOUPLE is

recommended. With this selection, cold junction compensation can

be obtained externally from the AIN1 block if Input 1 is a

thermocouple, or from another external source such as an RIM block

if Input 1 is not a thermocouple. See

Section 2.7.3 for block

connection information.

RESISTANCE 6 Input range is 0 to 430 ohms.

RTD 7 This selection applies to either a 2-wire or 3-wire RTD. Input range

is 0 to 430 ohms

Mode (MODE)..................................................................................................................... CWR

The mode of the block is determined by configuring and/or writing this attribute. Switching

mode is a reportable event.

MAN 0 The block result can be user written and the result quality is marked

good. The block input is the previous result or the last written result.

AUTO 1 The block input is processed using current data from the built-in

circuit.

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Micromod MOD: 30ML Functions Data Base Reference Manual do Utilizador Página 77