GE 8080-FC-10 16-pin cable for 8618 (1m)
HART capabilityThe HART capabilities of the Analogue Input
Module allow acquisition of secondary
variables – which can be used by a standard
(but not SafetyNet) application program.
The Module also allows Emerson’s AMS
package to communicate with any HART
field device transparently, using HART passthrough. (The first release of SafetyNet will
not have full HART capability, contact MTL
for further information).
LED’s
For the operation of the Power and
Fault LED’s see IO Module Overview.
Module ‘Channel’ LED’s
(yellow)
On – Channel in range (4-20mA)
Off – Channel inactive
Flashing (equal:mark space ratio) – Any of
the following, with an active channel: line
fault (indicated by the input measurement
being outside the 4-20mA range), loss of
HART signal, Hi-Hi or Lo-Lo alarm.
Alarms, Deadband, Dead Zone
The Analogue Input Module has a number
of configurable parameters for managing
setting and clearing alarms and triggering
the reporting of a new input value.
Hi, Hi-Hi, Lo and Lo-Lo alarms can be
configured – together with a Deadband
through which the input must move before
the alarm is cleared. The relationship
between these parameters is shown in the
diagram below.
A Dead Zone can also be configured, which
is the value by which an input measurement
must change before it is reported as a new
value.

♦ 8 single ended 4-20mA input channels
♦ Certified for use in SIL 2 safety applications
♦ Non-incendive field circuits
♦ 2-, 3- or 4-wire transmitters
♦ HART pass-through, acquisition and status reporting*
♦ 24V dc Bussed Field Power required from 8914-PS-AC
MODULE SPECIFICATION
See also System Specification
INPUTS
Number of channels ........................................8, single-ended
Nominal signal range (span) ....................................4 to 20mA
Full signal range ..................................................0.25 to 24mA
Line fault detection
Short circuit current ........................................................> 23.5mA
Open circuit current ........................................................< 0.5mA
Output voltage (@ 20mA)........................................10.2V (min.)
Output current ......................................................28mA (max.)
Accuracy (at 25oC) ..............................................± 0.1% of span
Temperature coefficient ............................................38 ppm/C
Resolution ........................................................................16 bits
Repeatability ......................................................0.05% of span
Data format ....................16-bit unsigned (0-25mA = 0-65,535)
HART data format ....................................IEEE754 floating point
Isolation
(any channel to Railbus) ............................................250V ac RMS
(between channels) ................................................................none
CONFIGURABLE PARAMETERS
Alarms. ......................................high, high-high, low and low-low
Alarm deadband (hysteresis) ..........................user defined value
Input filter time constant ..............................user defined value
Input dead zone ............................................user defined value
Drive on fault state ......................disabled /upscale /downscale
HART variable and status reporting .............. enable /disable
RESPONSE TIME
Signal change to availability on Railbus
4– 20 mA mode ........................................................25ms (max.)
HART mode........................................................0.75s per channel
* The first release of SafetyNet will not have full HART capability,
contact MTL for further information.