IDEC MICROSmart FC6A Series, Ladder Programming Manual

Page: 551 / 604

FC6A S
ERIES
MICROS
MART
L
ADDER
P
ROGRAMMING
M
ANUAL
FC9Y-B1726 27-5
27: F
LOW
C
ALCULATION
I
NSTRUCTIONS
Settings
The SCALE (Scale Analog Value) dialog box contains the Devices tab and the Settings tab.
The Devices tab configures the devices used with the SCALE instruction. The Settings tab configures the initial values of the
SCALE instruction parameters.
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Devices tab
(1) S1 (Source 1): Input Value
Specify the data register as the device that stores the input value to convert.
If the input value is greater than the input maximum value (S2+0) (input value > input maximum value (S2+0)), the input
maximum value (S2+0) is scaled.
If the input value is less than the input minimum value (S2+1) (input minimum value (S2+1) > input value), the input
minimum value (S2+1) is scaled.
(2) S2 (Source 2): Control Register
Specify the data register that stores the input maximum value, input minimum value, output maximum value, output
minimum value, and the dead band.
8 continuous words are used starting from the specified data register.
For details on the control registers, see "S2: Control registers" on page 27-7.
(3) S3 (Source 3): Initialization Input
Specify the input or internal relay as the device to initialize the control registers.
When the initialization input is on, the initial values configured on the
Settings tab in the SCALE (Scale Analog Value)
dialog box are stored in the control registers.
When the initialization input is on, the initial values are stored in the data registers with each scan. To execute initialization
only once, add the SOTU instruction (single output up) or the SOTD (single output down) instruction to the input conditions.
For how to configure the initial values, see "(2) Initial Value" on page 27-7.
(1) (2) (3) (4) (5)
(6)