Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 137)

Technical Notice
Connect R form the TIM block to the input RawData of the EX block.
Connect the R of the EX block to the INPUT of the LN block.
9. Optional: Add another EX block (tag name: CJTemp in the figure) to display the value of the
temperature at the terminals. This EX block will have inputs CJC (Floating point) and DampFact
(Floating point with internal data value of 2.0). The Expression for this EX block will be:
R + (CJC-R)/DampFact
The Result type is default (Floating point) for this EX block. Connect the CJC attribute from the TIM
block to the CJC input of this EX block as shown on the figure on the second page. This EX block’s
result can be connected to a display block to display the value of the temperature at the terminals. As
mentioned, this EX block is optional only and does not partcipate in the temperature calculation for
the B type T/C.
10. Compile your database.
Built-In Input 2 configured as B type T/C:
1. This scheme requires an AIN block, EX block and a LN block in your control strategy as shown in the
next figure:
2. The AIN block is configured as input number 2 and type as Thermocouple Type B.
3. Configure the desired Temperature scale.
4. Configure the EX block’s (mV2uVBI2). Add 3 inputs: RawData (Floating point), CJConst (Floating
point with internal data value of –0.003) and Dampfact (Floating point with internal data value of 25)
in the Inputs tab of this EX block.
5. Configure the Expression tab of this EX block by typing the expression:
R + (((RawData + CJCconst) * 1000)-R)/DampFact
6. Click on OK.
7. Configure the LIN block with the Linearization type as Thermocouple Type B. Choose the
appropriate Temperature scale.
Topic: MOD 30ML/Modcell Technote: TNML0501-1
MicroMod Automation, Inc. Rev. May-2001
B Type TC Problem.Doc Page 5 of 6