Response Electronics CL6011B Dokumentacja Pobierz pdf (Strona 266)

5Ć4 Configuration Tips

Original Ć June 1990CE4.2:CL6211

H Split Registers

5.3.1 Loadable Functions

Loadable functions may be used to conserve both FST steps and

general registers. Generally, loadable functions may be used as an

operand for any instruction which requires the use of a general register.

Refer to Table 4Ć6 on page 4Ć28 for a list of loadable functions, and

section 4.4, beginning on page 4Ć24, for definition of operands for

FST instructions.

Consider an application where it is desired to regulate flow from a pump,

as shown in Figure 5Ć2.

TK-1

PMP -1

FV-1

FV-1R

FT-1 FT-1R

DIF

FIC-1

Figure 5Ć2. Analog Loadable Function

The measured inputs are pump flow FT-1 and recirc flow FT-1R. The

process variable for a loop needs to be the difference between two

analog inputs. Following are two possible FST code segments which

accomplish the flow measurement:

AINSQR(2, FT–1R ), {Load recirc flow in SVA}

RGSTA( FT–1RFLW ), {Store in register FI–1RFLW}

AINSQR(1, FT–1 ), {Load pump flow in SVA}

DIF( FT–1RFLW ), {Determine out flow}

CNTRL,

STAT,

AOUT(1),

Loadable Function Method:

AINSQR(1, FT–1 ), {Load pump flow in SVA}

DIF(AINSQR(2, FT–1R )), {Subtract recirc flow to determine

out flow}

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Response Electronics CL6011B Dokumentacja Strona 266