Echelon i.LON 100 e2 Internet Server - Manual (Page 26)

2-12 Mounting, Cabling and Connections
Pulse Meter Inputs
The i.LON 100 server is provided with two impulse meter inputs. These pulse
meter inputs are in compliance with the DIN 43 864 impulse standard (open
terminal voltage <12VDC, maximum current ≤27mA). The supervision of the
inputs is under software control of the i.LON 100 server and its applications.
The meter input connections are implemented on screw terminals 9 through 12.
Meter 2 is connected to terminals 9-10 and Meter 1 is connected to 11-12. The
impulse meter inputs are polarity sensitive and the (+) and (-) connections for
Meter 1 and Meter 2 are noted adjacent to the terminals. Reversing the polarity
of the meter inputs will cause improper operation of the measurement circuits
and must be avoided.
A pulse meter registers a pulse when the circuit between its positive and
negative connections is closed (i.e. the Voltage is 0) for 30ms or longer; the circuit
must be open for a minimum of 30ms between pulses.