Page 1.2 MONITORED MULTIPLEXER MODULES 40-619
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SECTION 1 - TECHNICAL SPECIFICATION
1-Pole Monitored MUX, 40-619
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Overview
M1
C1
CH1.1 CH1.2 CH1.3 CH1.8 CH1.9
CH1.10 CH1.11 CH1.127 CH1.128
CH1.7
CH1.126
CH1.4
CH1.12
CH1.5
CH1.13
CH1.6
CH1.14
40-619-401 Single 128-Channel 1-Pole Multiplexer With Monitor
M1
C1
CH1.1 CH1.2 CH1.3 CH1.63 CH1.64
M2
C2
CH2.1 CH2.2 CH2.3 CH2.63 CH2.64
CH1.62
CH2.62
CH1.4
CH2.4
CH1.5
CH2.5
CH1.6
CH2.6
40-619-302 Dual 64-Channel 1-Pole Multiplexer With Monitor
40-619 Architecture
This diagram shows one multi-channel, one pole
multiplexer bank with monitoring capabilities (Default
position of the relays is shown). The lower relays
(Sub-unit 1 –Channel Switches) are the multiplexer
connections to the common (in this case, C1). The
top relays (Sub-unit 2 - Monitor Switches) are the
monitor relays. All monitor relays are connected to a
common monitoring bus (in this case, M1). It operates
as a conventional multiplexer routing signals on the
channel terminals to the common “C” terminal when the
corresponding relay is energized. Each channel includes
an additional relay which can be used to monitor the
state of the channel relay by routing the “C” signal to
the “M” bus if the channel is in the open condition. In the
default state seen above, all multiplexer channel relays
and all monitor relays are open circuit. As each bank has
a common monitor channel, only one channel per bank
can be tested at any time.
To verify that the channel relays are in the open-circuit
position and that the monitor relays are operating
correctly, each monitor relay should be operated, and
the continuity measured between M and C one monitor
relay at a time. Operating the 1-form-A monitor relay
will result in a low resistance path between the monitor
and common signals; de-selecting the monitor relay will
return to the open-circuit state.
During the verification testing, if a monitor relay is
operated, but an open-circuit condition remains, it
reveals that the associated channel relay is incorrectly
positioned, which indicates a fault condition, potentially a
welded channel relay or improper test code.
M1
C1
Ch1.1 Ch1.2 Ch1.3 Ch1.n-1 Ch1.n
Common
DMM
Sub-unit 2
Bank 1
Monitor Switches
Sub-unit 1
Bank 1
Channel Switches
Bit 1 Bit 2 Bit 3 Bit n-1 Bit n
Bit 1 Bit 2 Bit 3 Bit n-1 Bit n
40-619 1-Pole Multiplexer With Monitor - Architecture Showing Monitor Bus Usage
