Revision 10 ControlEdge HC900 Process & Safety Controller User and Installation Manual 83
May 2019
Terminal Block Styles
The terminal block is available in the barrier style, shown at
left in Figure 42, and the Euro style, shown at right. Not
shown: A Euro style with 36 connections is also available for
certain high capacity modules.
Terminal blocks have an embossed numbering “key” that
shows the numbering pattern of the 20/36 connections.
The frame associated with the terminal block has a transparent
hinged door. The hinged door is a tool secured cover. To open
the door, insert a flat screwdriver into the slot at the top and
bottom of the door while pulling out. The door has molded-in
tabs that hold labels, which are uniquely color-coded to
identify each module type.
Each label is printed on both sides. On the front (visible when
the door is closed) are I/O channel numbers, with spaces in
which tag names can be written. On the back (visible when
the door is open) are wiring patterns for the type of module
located in the slot.
Figure 42 – Terminal Block Styles
The 20-pin, inline connectors at the back of the terminal blocks are universal; that is, any type of I/O
module can be used with either the Barrier style or the Euro style terminal block. The 36-pin Euro
terminal blocks must be used with High Level AI, High Level AO, 32 DI, and 32 DO modules.
Terminal Block Colors and Keying
Both the barrier style and the Euro style are available in two colors (red and black). Black terminal
blocks, which have gold contacts, are used for low-voltage, low-energy signals such as analog inputs,
contact inputs and low DC voltages. Red terminal blocks, which have tin contacts, are used for higher
voltages such as 120/240 Vac.
Colors of each Terminal Blocks must correlate to that of the mating header on I/O modules with which
they are used; that is:
Black terminal blocks, which have gold contacts, are for use with I/O modules that have black
headers and gold pins in the 20-pin connector; these include: Analog Input, 4-channel Analog
Output, DC Input, DC Output, Contact Input, Pulse Input, Pulse Output, Frequency Input,
Quadrature Input.
Red terminal blocks, which have white (tin) contacts, are for use with I/O modules that have
red headers and white- (tin-) contacts in the 20-pin connector; these include: AC Input, AC
Output, and Relay Output.
36-pin black Euro terminal blocks, which have gold contacts, are for use with 8-point AO, 16-
point AO, 16-point AI, 32-point DI, and 32-point DO modules.
Terminal blocks must be keyed by the installer to prevent high voltage terminal blocks from
being installed on low voltage modules. See Table 14.
Any of the color-coded labels will fit into the door of any terminal block. Use care to ensure
that all hardware components match each other, and also match the control strategy in the
configuration file.
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