Manual Addendum 1010FMA-14
2
1010N-2 I/O Module
The conventional 1010N-2 I/O module provides the following:
l Two self-powered, isolated 4-20 mA current loops (signals Io1 and Io2) that are assign-
able and spannable by the user to many flowmeter variables such as flow, sonic veloc-
ity, 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.
l 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.
l 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):
l Alarms/Status/Totalizer pulses are generally presented as relay closures as either
Mercury Wetted Form 1A or Dry Reed Form C relays.
l Analog inputs, when provided, are in the form of 4-20 mA non-isolated inputs.
l 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:
l 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).
l 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 program-
ming assignments are as follows:
CHANNEL SIGNAL AUX Io METER MENU DISPLAY
C H 1 Pgen1 I o 1 V o 1
V o 1 I o 3 Pgen1
C H 2 Pgen2 I o 2 V o 1
V o 2 I o 4 Pgen1
TYPICAL 2-CHANNEL METER EXPANDED I/O OPTION CONNECTIONS
l Note that the four Aux Io outputs are externally powered.
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