Manual Addendum 1010FMA-14
2
May 2002
1010N-2 I/O Module
The conventional 1010N-2 I/O module provides the following:
z Two self-powered, isolated 4-20 mA current loops (signals Io1 and Io2) that are assignable and
spannable by the user to many flowmeter variables such as flow, sonic velocity, signal strength,
etc. These self-powered outputs also provide an industry-standard fault indication by dropping
to 2 mA if assigned to flow rate and under fault conditions. Note that these outputs, though
isolated from the system, are NOT isolated from each other.
z Two 0-10 Vdc outputs (signals Vo1 and Vo2) that are also assignable and spannable by the
user as above. These are also self-powered, but are not isolated from the system.
z Two 0-5000 Hz Pgen signals (Pgen1 and Pgen2) also assignable and spannable by the user.
These are TTL level pulses.
The 1010N/DN class of meters has a total of six analog outputs as indicated above. In addition (refer to
Installation Drawings 1010N-2-7 and 1010N-7-7):
z Alarms/Status/Totalizer pulses are generally presented as relay closures as either Mercury
Wetted Form 1A or Dry Reed Form C relays.
z Analog inputs, when provided, are in the form of 4-20 mA non-isolated inputs.
z The meter also has four non-isolated totalizer command lines providing Totalizer Clear and
Totalizer Hold (NoTot) functionality.
1010N-7 Expanded I/O Module Option
The Expanded I/O Module Option provides all of the above plus the following outputs:
z The four signals that drive the pulse generator outputs (Pgen 1 and Pgen2) and voltage outputs
(Vo1 and Vo2) of the meter create four current outputs: Aux Io1, Aux Io2, Aux Io3 and Aux Io4
(see diagram on next page).
z By spanning and assigning a system variable to 0-10 volt (Vo1 and Vo2) or 0-5000 Hz pulse
output (Pgen1 and Pgen2) the module simultaneously outputs these signals to the Expanded
I/O Module Option Aux outputs. For a 2-Channel meter the programming assignments are as
follows:
CHANNEL SIGNAL AUX Io METER MENU DISPLAY
CH1 Pgen1 Io1 Vo1
Vo1 Io3 Pgen1
CH2 Pgen2 Io2 Vo1
Vo2 Io4 Pgen1
TYPICAL 2-CHANNEL METER EXPANDED I/O OPTION CONNECTIONS
z Note that the four Aux Io outputs are externally powered.
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