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8 USING STO FUNCTION [G] [A]
8.4 Detailed explanation of interfaces
8.4
Detailed explanation of interfaces
This section provides the details of the I/O signal interfaces (refer to the I/O division in the table) as follows. Refer to this
section and make connection with external devices.
Page 218 STO I/O signal connector (CN8) and pin assignment
Sink I/O interface
Digital input interface DI-1
This is an input circuit in which photocoupler cathode side is input terminal. Transmit signals from sink (open-collector) type
transistor output, relay switch, etc.
Digital output interface DO-1
This is a circuit in which the collector of the output transistor is the output terminal. When the output transistor is turned on, the
current flows from the collector terminal.
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.
■
When outputting each of two STO states by using each TOFB
*1 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.
V
CES
≤ 1.0 V
I
CEO
≤ 100 μA
STO1
STO2
STOCOM
TR
Servo amplifier
For transistor
Approx. 5 mA
Approx. 3.0 kΩ
Switch
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
