■ Displaying control I/O signal terminals
The status of control I/O signal terminals can be displayed in two ways: with ON/OFF of each LED segment and in
hexadecimal.
•
Displaying the I/O signal status with ON/OFF of each LED segment
As shown in Table 3.4-9 and the figure below, each of segments “a” to “dp” on LED1 and LED2 lights when the
corresponding digital input terminal circuit ([FWD], [REV], [X1] to [X5], [EN1] and [EN2]) is closed (ON); it goes OFF
when it is open (OFF). Segment “a” or “b” on LED3 lights when the circuit between output terminal [Y1] or [Y2] and
terminal [CMY] is closed, respectively; it goes OFF when the circuit is open. Segment “a” on LED4 is for terminals
[30A/B/C] and lights when the circuit between terminals [30C] and [30A] is short-circuited (ON) and goes OFF when
it is open.
Table 3.4-9 Display of I/O Signal Status with ON/OFF of each LED segment
Segment LED4 LED3 LED2 LED1
a 30A/B/C Y1-CMY ― FWD
b ― Y2-CMY ― REV
c ― ― ― X1
d ― ― EN1 X2
e ― ― EN2 X3
f ― ― (XF) * X4
g ― ― (XR) * X5
dp ― ― (RST) * ―
—: No corresponding control circuit terminal exists
* (XF), (XR), and (RST) are assigned for communications control. Refer to “ Displaying control I/O signal
terminals under communications control” on page 3-26.
•
Displaying I/O signal status in hexadecimal
Each I/O terminal is assigned to bit 15 through bit 0 as shown in Table 3.4-10. An unassigned bit is interpreted as
“0.” Allocated bit data is displayed on the LED monitor as four hexadecimal digits (
0
to
f
each).
On the FRENIC-Ace, digital input terminals [FWD] and [REV] are assigned to bits 0 and 1, respectively. Terminals
[X1] through [X5] are assigned to bits 2 through 6. The bit is set to “1” when the corresponding input terminal is
short-circuited (ON), and it is set to “0” when the terminal is open (OFF). For example, when [FWD] and [X1] are ON
(short-circuited) and all the others are OFF (open),
0005
is displayed on LED4 to LED1.
Digital output terminals [Y1] and [Y2] are assigned to bits 0 through 3. Each bit is set to “1” when the output terminal
[Y1] or [Y2] is short-circuited with [CMY] (ON), and “0” when it is open (OFF).
The status of the relay contact output terminals [30A/B/C] is assigned to bit 8. It is set to “1” when the circuit between
output terminals [30A] and [30C] is closed, and “0” when the circuit between [30A] and [30C] is open.
For example, if [Y1] is ON, [Y2] is OFF, and the circuit between [30A] and [30C] is closed, then “
0101
” is displayed
on the LED4 through LED1.
Table 3.4-10 presents bit assignment and an example of corresponding hexadecimal display on the 7-segment
LED.
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