Board ET-OPTO RELAY4 ET-OPTO RELAY4

Board ET-OPTO RELAY4
ET-OPTO RELAY4
Board ET-OPTO RELAY-4 which is a set of 4 Channel Switch ON/OFF Contact
OPTO-ISOLATE OUTPUT uses to control operation of electric devices as ON/OFF
Contact. It uses signal Logic TTL to control RELAY operation and circuit that
uses to control RELAY operation is OPTO-ISLATE circuit. It protects controller
circuit or Board Microcontroller from signal interruptions of RELAY operation
and Output devices that controls operation of RELAY Contact and it makes
Microcontroller system more efficient and reliable. Circuit of RELAY operation
is designed to run with status Logic “0” and stop running with status Logic “1”
because it protects RELAY not to run while Microcontroller system is being
RESET status or signal controller of Board ET-OPTO RELAY4 is let free.
Picture displays structure of board ET-OPTO RELAY4.
VCC
10K
LED
+12V
560
1K
1N4001
OUTPUT
+12V
BC557
PC817
RELAY
330
1K
BC547
3
2
1
NC
COM
NO
47K
RELAY
Picture displays circuit of 1 Channel ET-OPTO RELAY4.
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Board ET-OPTO RELAY4
Board Operation
Board ET-OPTO RELAY-4 controls the operation of Switch Contact devices,
user needs to input power supply as +12VDC to supply electricity into RELAY
coil. User should use adapter for RELAY operation differently from adapter for
Board Microcontroller because it can protect Microcontroller circuit from any
interruption while RELAY or OUTPUT devices that are controlled by RELAY are
running.
Board operation starts to run when there’s Logic “0” into OUTPUT circuit,
it makes Base PIN of Transistor BC557 on Input part of OPTO ISOLATE (PC817) is
received the correct BIOS. After that Transistor will take +VCC (+5VDC) out
from Pin Emitter and take into Collector through 330 Ohm Registor to limit
current for OPTO ISOLATE (PC817). It makes OPTO ISOLATE circuit runs and
current flows from power supply +12VDC through OUTPUT part of OPTO ISOLATE
(PC817). Power supply +12VDC is limited current by Resistor 1KOHM before input
them into Base PIN of Transistor BC547 that is connected with OUTPUT part of
OPTO ISOLATE. It makes Transistor BC557 convey the current and when power
supply flows through coil of RELAY, it makes RELAY and LED run. For Board
application, it uses to control operation of ON/OFF Contact device. There’s two
types of RELAY Contact; NO and NC, user need to select only one type for
connecting with COM (Common) PIN.
- NO or Normal Open: It means that Contact as normally open. It runs when
RELAY starts to run.
- NC or Normal Close: It means that Contact as normally close. It stops
to work when RELAY starts to run.
There are two methods to interface signal TTL with Output circuit of
Microcontroller. Firstly, it is interfaced by using IDE 10 PIN connector. User
needs to use Pair cable and can assign signal TTL to run in board as two
groups; LOWER and UPPER. Secondly, it is interfaced by using CPA 6 Pin
connector as shown in the table.
Output
Connector
(Terminal)
RELAY0
RELAY1
RELAY2
RELAY3
Table
shows
signal
LOWER
IDE 10 Pin
CPA 6 Pin
Px0
Px1
Px2
Px3
connecting
UPPER
IDE 10 Pin
CPA 6 Pin
OUT0
OUT1
OUT2
OUT3
point
Px4
Px5
Px6
Px7
of
Board
OUT0
OUT1
OUT2
OUT3
ET-OPTO
RELAY4
with
Microcontroller.
ETT CO.,LTD
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Board ET-OPTO RELAY4
Px0
Px2
Px4
Px6
+5V
+5V
OUT0
OUT1
OUT2
OUT3
GND
Px1
Px3
Px5
Px7
GND
Picture displays arrangement of IDE-10 PIN and CPA-6 PIN Connector.
ETT CO.,LTD
-3-
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