VMA436
V. 02 – 21/01/2019
3
©Velleman nv
5.
Overview
VMA436
This 8-channel relay interface board can control various appliances and other equipment with high current.
Directly controllable by any micro-controller.
control input current (in1 to in8): 5-25 mA
control input voltage: 5-12 VDC
relay output: 250 V~, 10 A / 30 VDC, 10 A (non-inductive)
relay coli vintage: 5 VDC
dimensions: 57 x 138 mm
operating voltage: 5 V
6.
Pin Layout
VCC
power supply
GND
ground
IN1
low-level signal triggering terminal 1 of relay module
IN2
low-level signal triggering terminal 2 of relay module
IN3
low-level signal triggering terminal 3 of relay module
IN4
low-level signal triggering terminal 4 of relay module
IN5
low-level signal triggering terminal 5 of relay module
IN6
low-level signal triggering terminal 6 of relay module
IN7
low-level signal triggering terminal 7 of relay module
IN8
low-level signal triggering terminal 8 of relay module
COM
common ground for the relay, normally connected to GND by jumper
GND
ground
7.
High vs. Low Level
(Inx = contact such as IN1, IN2, IN3…)
Triggered at high-level means a forward voltage exists between the signal-triggering terminal (INx) and
negative supply voltage. It generally connects the positive supply voltage and the triggering terminal together.
When the triggering terminal has a positive supply voltage or reaches triggering voltage, the relay will pull in.
Triggered at low-level means the voltage between the signal-triggering terminal (INx) and negative supply
voltage is 0 V, or the voltage at the triggering terminal is lower than the positive supply voltage. If it lowers to
a triggering voltage, the relay will pull in. It generally connects negative supply voltage and triggering terminal
together.
The output:
Each sub modular of the relay has one NC (normally closed), one NO (normally open) and one COM (common).
There are 8 NC, 8 NO and 8 COM of the channel relay in total. NC stands for the normally closed port contact
and the state without power; NO stands for the normally open port contact and the state with power; COM
means the common port. You can choose the NC port or NO port according to whether it will be powered or not.
