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11.15 HMX4248 I/O MODULE FOR HMX32128
11.15.1 General
The HMX4248 module is an I/O (Input/Output) expander for the HD Series MAXPRO-
Net
Subrack. The unit features twenty-four alarm inputs, which may be configured as
®
either contact closure or end-of-line resistor sensing (dip switch selectable on the MX-
128 controller card), and eight relay outputs.
11.15.2
Installation
a) Fit the MX-4248 to the rear of the MX-32128 subrack utilizing the mounting stand-off
posts and screws supplied.
b) Connect the MX-4248 to the MX-128 using the supplied ribbon cable (take care not
to dislodge the MX-128 when seating the connector).
3) Select the required operating mode on the MX-128 (dip switch 3, position 4 – OFF =
contact closure mode, ON = end-of-line resistor mode).
4) Connect field cabling to input/output connectors.
11.15.3
Contact Closure, or End-Of-Line Modes
CC (Contact Closure) Mode
When configured in the CC mode, the HMX4248/HMX128 will detect contact state
changes accordingly to the NO/NC setting as defined in the Alarm Input table in
SETMAX.
EOL (End-Of-Line) Mode
In the EOL mode a setting of NC in SETMAX will cause an alarm to become active when
the alarm loop becomes either open or short circuit (unsealed). Conversely, in the NO
mode the alarm will become active when the loop is in the "sealed" position.
11.15.4
Specifications (MX-4248)
Alarm Inputs:
Operating Mode:
Maximum Input Voltage:
Noise Immunity:
Control Outputs:
Maximum Current:
Maximum Voltage:
Rev. C
24
Contact Closure or End-Of-Line Resistor
(EOL value = 10K OHM)
+ / - 20V
6V p-p AC @ 50/60 Hz
8
1 Amp
50V
11-12
HMXMU001018
10/06
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