Spectrum-controls 140 MPM 204 00sc Manual do Utilizador descarregar pdf (Página 39)

Meter Proving Module

The process for updating the scale coefficients and the count limits is as follows:

1. Set the Scale/Limit Word to its desired value (4x+1 register). This must be performed before

updating the module control word.

2. Set the following bits on the module control word (register 4X+0) to the appropriate state for

the value to be written:

a. Channel Number

b. Parameter Definition

c. Enable Scale/Limit Word (set to 1)

Note: This bit can be set at the same time as the channel number and parameter definition, but

not earlier.

3. Read Module Status word (Register 3X+8) and verify the Enable Scale/Limit Word bit is set.

This verifies the module has received the control word update.

4. Set the Enable Scale/Limit Word bit to 0.

5. Update other Scale/Limit values by redoing steps 1 through 7.

To store K, M, and R values into the EEPROM perform the following:

1. Set the Program EEPROM bit (bit 2) in the Control Word (Register 4X+0).

2. Read Module Status word (Register 3X+0) and verify the Program EEPROM Echo(bit 2) is

set. This verifies the module has received the control word update.

3. Verify the Program EEPROM Echo bit has been set in the Module Status Word.

4. Zero the Program EEPROM bit and the Enable Scale/Limit Word bits in the Module Control

Word.

Please refer to our website, www.spectrumcontrols.com, for ladder logic samples and technical

notes.

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Spectrum-controls 140 MPM 204 00sc Manual do Utilizador Página 39