37
4 Specifications
No. 99MBE048B
Alarm behaviors
Item
Behavior
Line driver output
When the high impedance mode
is on
All output is put in high impedance (not
electrically H nor L but like floating).
When the high impedance mode
is off
The AL signal (active L) is output. How-
ever, others (PA, PA, PB, PB, PZ, PZ)
also continue to be output.
Alarm light
The POWER light changes from green
to red.
Resetting the alarm
z
Turning on the power again
1
Eliminate the cause of the alarm.
2
Turn off the control unit and turn it on again after 10 seconds or more.
z
Alarm reset signal
3
Eliminate the cause of the alarm.
4
Input the alarm reset signal (pulse width of 10 ms or more).
Tips
• The alarm can be reset by the alarm reset signal only when the main signal output type is B (two-phase
square wave + external reset input).
• Connect the alarm reset input circuit so that the current is 3 mA–10 mA.
•
Since the product is equipped with a resistor (1.2 kΩ) inside, applying 5 V–12 V between the reset input AL
(anode) and reset input AL (cathode) resets the alarm.
1.2 kΩ
TLP521
5
6
+V
+V
-V
I/F Box side
Control unit
Reset input
Reset input AL
(anode)
Reset input AL
(cathode)
For the photocoupler
For the relay
• To apply 12 V or more, add a resistor externally.
