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Details :
The 4-20 mA 2ML L Mixed Input/Output (I/O) modules
provide a combination of features that satisfy the
needs of many smaller sites. The module provides eight
wet digital inputs that may be used as low-speed counters
under application control.
An isolated 24 Vdc wetting voltage is provided so
the open/closed state of dry-contact sensors may be
determined. Each of the inputs are opto-isolated from
the remaining circuitry on the modules to provide
the highest possible input surge immunity.
There are two 4-20 mA analog inputs. Each of the
inputs, plus ground, are opto-switched into a precision
A-to-D converter; ground is measured so short-term
drift may be canceled. Simply put, there are 4000
steps over the total ±20 mA range with 40%
(1600 steps) of the total range in active use. The
24 Vdc wetting voltage may be used to power the analog
loops provided that isolation between the DI, AI,
and AO circuits is not required.
The ML option provides a module with
two magnetically-latched relays . Internal feedback
from each relay is available so the application may
determine the state of the relays.
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