Siemens SPS starter kit 6ED1057-3BA00-0AA8 12 Vdc, 24 Vdc 6ED1057-3BA00-0AA8 データシート

製品コード

6ED1057-3BA00-0AA8

LOGO! functions

4.4 Special functions list - SF

LOGO!
Manual, 06/2014, A5E33039675

229

The number of operand values is fixed at four and the number of operators is fixed at 3. If

you need to use fewer operands, use constructions such as + 0 or * 1 to fill the remaining

parameters.
You can also configure the behavior of the function when the Enable parameter En=0. The

function block can either retain its last value, or be set to 0. If the parameter Qen → 0 = 0,

then the function sets AQ to 0 when En=0. If the parameter Qen → 0 = 1, then the function

leaves AQ at its last value when En=0.

Possible errors: zero division and overflow

If the mathematic instruction function block execution results in zero division or overflow, it

sets internal bits that indicate the type of error that occurred. You can program a mathematic

instruction error detection function block in your circuit program to detect these errors, and to

control the program behavior as needed. You program one mathematic instruction error

detection function block to reference one specific mathematic instruction function block.

Examples

The following tables show some simple example mathematic instruction block parameters,

and the resulting equations and output values:

Op1

(Priority)

Op2

(Priority)

Op3

(Priority)

[+]

(/)

Equation: [12 + (6 / 3)] - 1
Result: 13

Op1

(Priority)

Op2

(Priority)

Op3

(Priority)

(+)

[*]

Equation: 2 + [3 * (1 + 4)]
Result: 17

Op1

(Priority)

Op2

(Priority)

Op3

(Priority)

100

(-)

[+]

Equation: (100 - 25) / [2 + 1]
Result: 25