3 Part Names and Functions
3 - 4
NX-series Analog I/O Units User’s Manual for Analog Input Units and Analog Output Units (W522)
The NX-TB2 and NX-TB1 Terminal Blocks have different terminal current capacities.
The NX-TB2 has 10 A and NX-TB1 has 4 A.
To differentiate between the two models of terminal blocks, use the terminal number column indica-
tions. The terminal block with white letters on a dark background is the NX-TB2.
You can mount either NX-TB1 or NX-TB2 Terminal Blocks to the Units that the current
capacity specification of the terminals is 4 A or less.
You can only mount the NX-TB2 Terminal Block to the Units that the current capacity specifi-
cation of the terminals is greater than 4 A.
• Each of the Analog Input Units and Analog Output Units is compatible with only one of three
types of terminal blocks. You cannot use a terminal block with a number of terminals that
differs from the specifications for a particular Unit.
• The 8-terminal type and 12-terminal type do not have terminal holes and release holes for
following terminal numbers.
8-terminal type: A2, A4, A6, A8, B2, B4, B6, and B8
12-terminal type: A7, A8, B7, and B8
Let-
ter
Name Function
(A) Terminal number indi-
cations
Terminal numbers for which A to D indicate the column, and 1 to 8 indicate
the line are displayed.
The terminal number is a combination of column and line, i.e. A1 to A8 and
B1 to B8.
The terminal number indications are the same regardless of the number of
terminals on the terminal block.
(B) Release holes Insert a flat-blade screwdriver into these holes to connect and remove the
wires.
(C) Terminal holes The wires are inserted into these holes.
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