Model M1431B 8 VC ISO0 pages

MAXIFLEX 8VC ISO Module
Model M1431 Individually Isolated 8 way Voltage/Current Input Module.

DATASHEET
FEATURES
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Fits in any MAXIFLEX base I/O slot

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8 individually Isolated Voltage/Current Inputs

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High interchannel isolation for industrial applications

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Intelligent Module provides direct conversion to either
Percentage or direct voltage reading.

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Four Alarm/Trip setpoints per input.

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Removable Terminal Blocks

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Hot Plug-in

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In system automatic module detection

DESCRIPTIONThe M1431 8VC ISO module provides 8
voltage or current inputs. The inputs are individually
galvanically isolated. This intelligent module is software
configurable, and allows each input to be configured for
a different input type and range.
The input value can be read as either a scaled
percentage value to 2 decimal places, or the actual
voltage/current input value as a signed integer to 3
decimal places. eg 0.00% to 100.00% or 1.000 to
5.000V. Over-range and under-range inputs are read as
–32768 and 32767 respectively.
Current inputs are converted to voltage using an
external resistor placed across the input terminals. This
allows the plug-in inpute terminals to be removed
without breaking the current loop. The value of resistor
used to configurable in the range 50Ω to 500Ω.
Each input has four software settable alarm/trip
setpoints and a deadband value. The status of the
alarm/trip signals is available as derived digital inputs

from the module.
With the aid of an accurate DC voltage source and the
M1431A calibration software, the module can be field
calibrated by the user if required.
The module may be inserted into any I/O slot in a
Maxiflex system.
Inputs are terminated on plug-in screw terminals.
The module can be inserted or removed while the
system is powered.
Auto-detection capability allows the CPU to recognise
the presence of this module in the system.
All configuration and dynamic data are made available
to the system CPU through a module Data Interchange
Table. The module is configured by writing the
appropriate values to this table, and the dynamic values
are read by reading from this table.

SPECIFICATIONS
Inputs

Isolation

Quantity

8

Input to system logic

100% tested to 1500Vac rms (60s)

Standard Voltage ranges

0-1V; 0-5V; 1-5V; 0-10V; 2-10V

Input to Input

100% tested to 500Vac rms (60s)

Standard Current ranges

0-20mA; 4-20mA; 0-50mA; 1050mA

Insulatio resistance

>20MΩ at 500Vdc

Input Impedance

1MΩ (excl. current sense resistor)

Linearity

0.04% of span max.

Temperature Drift

100ppm/°C typical

Output Reading

Direct Voltage, Current or %

Input Resolution

1mV or 1µA

Accuracy:

Input Range
0-10V
2-10V
0-5V
1-5V
0-1V

ResponseTime 10-90% step

Interference Rejection
No effect up to 400Vac rms

NMRR at 50/60Hz

% Accuracy
0.017%
0.021%
0.033%
0.042%
0.17%

CMRR at 50/60Hz

50dB

LED Indication
CPU OK

ON = operating correctly
Flashing = Module failure
OFF = No Power or module failure

Output Termination
Types

Screw clamp Plug-in Terminal
Blocks and 20 way ribbon header

Settles to within 3% in 200ms

Copyright Omniflex ♦ Subject to change without notice

Datasheet DSC1431AR02 sheet 1 of 2

http://www.omniflex.com

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