Chapter 7：Digital Output (Do) Circuit - FATEK FBs Series User Manual

Chapter 7
The digital outputs of FB
differential output (i.e., one output occupying two terminals), and the single-end output circuit for saving terminals.
There are three kinds of output device for the single-end output, which are relays, TRIAC and transistors. Since the
relay and TRIAC are bilateral, even when used in single-end output, they can serve as SINK or SOURCE output. The
transistor, however, because of its polarities, after being used as single-end common output, its SINK and SOURCE
polarities are exactly the opposite (common point Cn of SINK output must connect to negative end of DC power).
Therefore, the product model of transistor output of FB
terminal block of FB -PLC, there is a place for making SINK or SOURCE label.
S
No over current protection is available in the FB
other output circuits have to be added with over current or short circuit protections externally, such as fuses,
in applications with safety concern.
Terminals labeled by 〝●〞 on the terminal block are empty contacts, which cannot be connected with any wire
to maintain the required safety clearance and to avoid damage to the unit.
In situations where simultaneous operations of outputs(such as reverse/forward action of motor) pose safety
concerns, besides the interlock in PLC programs, additional interlock circuits are needed outside PLC, as
shown below：
Digital Output (DO) Circuit
-PLC are available in the following two structures: the 5VDC ultra high speed Line-driver type
S
PLC
PLC
Forward
正轉輸出
output
輸出
Output
輸出
Output
PLC
PLC
Reverse
反轉輸出
output
-PLC for SINK and SOURCE is distinct. At the right side of
S

Warning
series PLC. Except for the 5V differential output circuit, all
S
Magnetic
Interlock
Forward
正轉極 電磁開關或
互鎖接點
switch or
contact
limit switch
限開關
繼電器A
(NC)
(NC)
Magnetic
電磁開關或
Reverse Interlock
反轉極 互鎖接點
switch or
Limit contact 繼電器B
(NC)
限開關
switch (NC)
H 7 - 1
Relay A
Relay B