8 USING STO FUNCTION
8.4 Detailed explanation of interfaces
331
8
Source I/O interface
For the servo amplifiers in this manual, source type I/O interfaces can be used.
Digital input interface DI-1
This is an input circuit in which the anode of the photocoupler is the input terminal. Transmit signals from a source (open-
collector) type transistor output, relay switch, etc.
Digital output interface DO-1
This is a circuit in which the emitter of the output transistor is the output terminal. When the output transistor is turned on, the
current flows from the output terminal to a load.
A maximum of 5.2 V voltage drop occurs in the servo amplifier.
■
When outputting each of two STO states by using each TOFB
*1 If the voltage drop (a maximum of 2.6 V) interferes with the relay operation, apply high voltage (a maximum of 26.4 V) from an external
source.
■
When outputting two STO states by using one TOFB
*1 If the voltage drop (a maximum of 5.2 V) interferes with the relay operation, apply high voltage (a maximum of 26.4 V) from an external
source.
V
CES
≤
1.0 V
I
CEO
≤
100
μ
A
STO1
STO2
STOCOM
Servo amplifier
Approx. 3.0 k
Ω
Switch
Approx. 5 mA
24 V DC ± 10 %
300 mA
TOFCOM
TOFB2
TOFB1
Servo amplifier
If polarity of diode is
reversed, servo amplifier
will malfunction.
Load
Load
24 V DC ± 10 %
*1
300 mA
TOFCOM
TOFB2
TOFB1
Servo amplifier
If polarity of diode is
reversed, servo amplifier
will malfunction.
Load
24 V DC ± 10 %
*1
300 mA
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