Using negative logic for programmable I/O terminals
The negative logic signaling system can be used for digital input terminals and transistor output
terminals by setting the function code data specifying the properties for those terminals.
Negative logic refers to the inverted ON/OFF (logical value 1 (true)/0 (false)) state of input or
output signal. An active-ON signal (the function takes effect if the terminal is short-circuited.) in
the normal logic system is functionally equivalent to active-OFF signal (the function takes effect
if the terminal is opened.) in the negative logic system. An active-ON signal can be switched to
active-OFF signal, and vice versa, with the function code data setting.
To set the negative logic system for an input or output terminal, enter data of 1000s (by adding
1000 to the data for the normal logic) in the corresponding function code.
Example: "Coast to a stop" command
BX
assigned to any of digital input terminals [X1] to [X3]
using any of function codes E01 through E03.
Function code data
BX
7
Turning
BX
ON causes the motor to coast to a stop. (Active ON)
1007
Turning
BX
OFF causes the motor to coast to a stop. (Active OFF)
Limitation of data displayed on the LED monitor
Only four digits can be displayed on the 4-digit LED monitor. If you enter more than 4 digits of
data valid for a function code, any digits after the 4th digit of the set data will not be displayed;
however they will be processed correctly.
The following tables list the function codes available for the FVR-Micro of inverters.
F codes: Fundamental Functions
Code
Name
Data setting range
Incre-
ment
Unit
Change
when
running
Data
copying
Default
setting
F00
Data
Protection
0: Disable both data protection and
digital reference protection
1: Enable data protection and disable
digital reference protection
2: Disable data protection and enable
digital reference protection
3: Enable both data protection and digital
reference protection
–
–
Y
Y
0
F01
Frequency
Command 1
0: UP/DOWN keys on keypad
1: Voltage input to terminal [12] (0 to
+10
VDC)
2: Current input to terminal [C1] (4 to 20
mA DC)
3: Sum of voltage and current inputs to
terminals [12] and [C1]
4: Built-in potentiometer (POT)
7: Terminal command
UP/DOWN
control
–
–
N
Y
4
5-2
