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5Ć8 Configuration Tips

Original Ć June 1990CE4.2:CL6211

Note

Whenever performing this type of split function

operation with registers it is especially important to

document the use of each register DDP for operations

and maintenance personnel.

5.4 Tunable Discrete I/O Logic

Often, during implementation of control strategies which use discrete I/O,

it is necessary to invert the logic the discrete input or output is using to

match field equipment. Although it is possible to modify the

configuration, changing FST instructions to invert the logic, the inversion

may be accomplished via a tuning parameter. Consider the following

FST code segments:

DI(1), {Read Discrete Input}

XOR( DI1_NOT ), {Tune Discrete Logic}

XOR( DO1_NOT ), {Tune Discrete Logic}

DO(1), {Output logic}

As demonstrated in the truth table below, when the register is set to a

logic 0, the SVD passes unchanged. If the register is set to a logic 1, the

discrete logic is inverted. The register used should be a reference

desired value. The discrete portion of the register should be included in

a register DDP list to make the discrete logic tunable.

Value

XOR SVD

Input

XOR SVD

Output

Logic Normal

Logic Inverted

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Response Electronics CL6011B Spezifikationen Seite 270