I/O Module Installation and Wiring - Module Placement in Racks
58 HC900 Hybrid Controller Installation and User Guide Revision 5
9/03
Terminal Block Styles
The terminal block is available in the barrier style, shown at left in
Figure 26, and the Euro style, shown at right.
Both styles of terminal blocks have an embossed numbering "key"
that shows the numbering pattern of the 20 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
tagnames 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 26 - 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.
ATTENTION
Before mounting terminal blocks in the rack, be sure they are properly keyed to the module
type they will be used with. See I/O Installation Procedures, page 63.
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-colored contacts, are used for low-voltage, low-energy signals such as contact inputs and
low DC voltages. Red terminal blocks, which have tin-colored 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-colored contacts, are for use with I/O modules that have black
headers and gold-colored pins in the 20-pin connector; these include: Analog Input, Analog Output,
DC Input, DC Output, and Contact Input.
• Red terminal blocks, which have white (tin) contacts, are for use with I/O modules that have red
headers and white- (tin-) colored contacts in the 20-pin connector; these include: AC Input, AC
Output, and Relay Output.
• Terminal blocks may 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. Use
of documentation aids in Appendix A will facilitate correct use of labels.
