User Manual

<17. IS Function Block>
17-3
IM 21B04C01-01E
17.2 Input Section
17.2.1 Mode Handling
The Input Selector block’s operations are determined by the mode (parameter name: MODE_BLK). The
following describes operations in each mode.
Supported
Mode
Role
O/S
(Out of Service)
• System-stopped status
• Allows you to make changes to
conguration.
Man
• If you do not want to output the
value and status from IN or if the
value or status thus output is not
preferable, you can manually
transmit the value to OUT.
Auto
• Automatic system operation status
17.2.2 MIN_GOOD Handling
If there is no selectable input or if the number of selectable inputs is less than the value of MIN_GOOD,
SELECTED becomes “0.”
A case where the number of valid INs is less than the value of MIN_GOOD:
F1702.ai
OUT = certain retained
value that was
output previously
IN_1 = 23
SELECT_TYPE = Middle
STATUS_OPTS
MIN_GOOD = 3
SELECTION
SELECTED = 0
IN_2 = 34.5
IN_3 = 45
IN_4 = 2.34
IN_5 = 23.6
IN_6 = 15.5
IN_7 = 32.5
IN_8 = 27.4
DISABLE_1 = ON
DISABLE_2 = ON
DISABLE_3 = OFF
DISABLE_4 = ON
DISABLE_5 = OFF
DISABLE_6 = ON
DISABLE_7 = ON
DISABLE_8 = ON
OP_SELECT = 1
Figure 17.2 Example (1)
This example restricts the valid inputs using DISABLE_n, and the inputs are enabled only at DISABLE_3 and
DISABLE_5. Because the effective number of MIN_Good is 3, the input specied by OP_SELECT will not be
output.