User's Manual

Page 24 E2 Wireless I/O
The Failsafe state if ticked (ON) will indicate with the LED being on and briefly flicking
off.
The Failsafe state if un-ticked (OFF) will indicate with the LED being off and briefly
flicking on.
Analog Inputs
The E2 provides two floating differential analog inputs and two grounded single-ended
analog inputs.
Analog Input 1 & 2 can be configured to measurement current (0-20 mA) or Voltage (0-
25V).
Analog input 3 & 4 can be configured to measure current (0-20mA) or voltage (0-5V).
An internal 24V analog loop supply (ALS) provides power for any current loops with a
maximum current limit of 175mA.
The LEDs have an analog diagnostic function and will indicate the status of the input.
If the current is less than 3.0 mA the LED will be off and if greater than 20.5mA the LED
will be on (Depending on scaling).
The LED will flicker with the duty cycle relative to the analog reading in this range. (Note
by default there is a 5 second delay on the input because of the Filter)
LEDs beside AI1+, AI2+ flash according to current on these inputs. LEDs beside AI1-
and AI2- flash according to the voltage on the Analog inputs.
Floating Differential Analog Inputs (AIN 1 & 2 only)
Differential mode current inputs should
be used when measuring a current loop,
which cannot be connected to earth or
ground. This allows the input to be
connected anywhere in the current loop.
Common mode voltage can be up to
27VDC.
The diagram across indicates how to
connect Loop powered or externally
powered devices to the E2 Differential
Inputs.