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108 L4400 User’s Guide
4 L4421A 40-Channel Armature Multiplexer
34921T Terminal Block
This terminal block with screw- type connections is labeled with the model
number and the abbreviated module name.
The 34921T is the only terminal block that provides an isothermal
block with temperature reference for thermocouple measurements.
The temperature sensor is located on the bottom side of the PC board
as shown below. Also shown are two holes that you can use for connecting an
external temperature reference to the terminal block.
NOTE
All modules that connect to the analog bus are interlock protected.
This means that when an installed module is exposed
(no terminal block or cable is connected), the analog bus relays are
open and disconnected from the analog buses. See page 100 for
further information.
Te m p e ra t u r e
Sensor
34921T (viewed from bottom side)
External
Reference
CAUTION
When wiring the terminal block via cables to the mainframe, make
sure the cables are connected to the correct connector. The cables
provide communication and power to the temperature sensor on
the 34921T terminal block. If cabling is not correct, an error may
occur indicating that the L4421A module is not fully operational.