A question on I/O module
- Thread starter Karoly
- Start date
bernie_carlton
Lifetime Supporting Member + Moderator
The module has a limited space for terminals. If each output had its own common only 5 outputs would be possible on this particular module.
kolyur
Lifetime Supporting Member + Moderator
A few reasons:
1. If the outputs are relay type, multiple commons allow you to use different voltages.
2. Dropping the power to the output common is a usual way of providing machine safety. With multiple commons you can disable some outputs but not others.
1. If the outputs are relay type, multiple commons allow you to use different voltages.
2. Dropping the power to the output common is a usual way of providing machine safety. With multiple commons you can disable some outputs but not others.
Also, with two or more commons, you can use them for separate circuits, or easily add jumpers to make into 1 circuit with 1 common. If there were not multiple commons, how would you be able to easily split 1 common into multiple circuits?
Triac outputs (as well as relays) allow multiple circuits, because many triacs will work on a range of AC voltages.
Triac outputs (as well as relays) allow multiple circuits, because many triacs will work on a range of AC voltages.
kolyur
Lifetime Supporting Member + Moderator
This is true for relay outputs, but NOT necessarily for DC transistor outputs. Most transistor output modules that I've worked with have to be ordered as sinking or sourcing, which dictates whether positive or zero voltage is connected to the commons.
When it comes to DC input modules, most (not all) of them can be wired as sinking or sourcing--another reason where multiple commons can be a benefit.
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