13. USING STO FUNCTION
13 - 10
13.4 Detailed description of interfaces
This section provides the details of the I/O signal interfaces (refer to the I/O division in the table) given in
section 13.2. Refer to this section and make connection with the external device.
13.4.1 Sink I/O interface
(1) Digital input interface DI-1
This is an input circuit whose photocoupler cathode side is input terminal. Transmit signals from sink
(open-collector) type transistor output, relay switch, etc.
Approx. 3.0 kΩ
STO1
STO2
Servo amplifie
Switch
Approx. 5 mA
For transistor
STOCOM
TR
V
CES
1.0 V
I
CEO
100 µA
24 V DC ± 10%
500 mA
(2) Digital output interface DO-1
This is a circuit of collector output terminal of the output transistor. When the output transistor is turned
on, collector terminal current will be applied for the output.
A lamp, relay or photocoupler can be driven. Install a diode (D) for an inductive load, or install an inrush
current suppressing resistor (R) for a lamp load.
(Rated current: 40 mA or less, maximum current: 50 mA or less, inrush current: 100 mA or less) A
maximum of 5.2 V voltage drop occurs in the servo amplifier.
(a) When outputting two STO states by using each TOFB
TOFCOM
Servo amplifier
TOFB2
If polarity of diode is
reversed, servo amplifier
will malfunction.
LoadTOFB1
Load
(Note)
24 V DC ± 10%
500 mA
Note. If the voltage drop (maximum of 2.6 V) interferes with the relay operation, apply high
voltage (maximum of 26.4 V) from external source.
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