8 •
750-408 [4 DI DC 24 V 3.0 ms, Low-Side Switching]
Description
WAGO-I/O-SYSTEM
750
I/O
Modules
2.1.1.2 Description
The digital input module 750-408 receives control signals from digital field
devices (sensors, switches, etc.).
The module is a 2- to 3-conductor device and has 4 input channels. Two
sensors may be directly connected to the module.
As an example, two 3-conductor sensors can be directly connected using
connection 24V, 0V and signal input DI1 or DI2. The connection of more
sensors to signal inputs DI3 and DI4 requires a field side connection module
(750-614) for 24V and for 0V, if need be.
The module is low-side switching, which means that the status of the input
channels is "high" if the input channels switch to 0V.
Each input module has an RC noise rejection filter with a time constant of
3.0 ms.
The status of the input channels is indicated via status LEDs.
An optocoupler is used for electrical isolation between the bus and the field
side.
Any configuration of the input modules is possible when designing the
fieldbus node. Grouping of module types is not necessary.
The field side supply voltage of 24 V for the input module is derived from
adjacent I/O modules or from a supply module
.
The supply voltage for the
field side is made automatically through the individual I/O modules by means
of power jumper contacts.
Warning
The maximum current of the internal power jumper contacts is 10 A. When
configuring the system it is important not to exceed the maximum/sum
current. However, if such a case should occur, another supply module must be
added.
The digital input module 750-408 can be used with all couplers/controllers of
the WAGO-I/O-SYSTEM 750.
