Honeywell Low Votage RTP Cable (5.0M, 16.4ft.) Note 6 (NOT FOR SIL2 SYSTEMS) 900RTC-L150
Set scanner address for the I/O rack
using the Scanner Module DIP
switches on SW3 (shown at right). For
C50/C70, use addresses 1-11. For
C75, use addresses 1-12.
Scheme 1 (upto 5 racks):
DIP switches 6-8 must be OFF. Only
one DIP switch may be ON:
DIP switch 1 ON = Scanner 1
DIP switch 2 ON = Scanner 2
DIP switch 3 ON = Scanner 3
DIP switch 4 ON = Scanner 4
DIP switch 5 ON = Scanner 5
Scheme 2 (upto 12 racks):
DIP switch 6 NO Always and
1 ON = Scanner 1
2 ON = Scanner 2
2 & 1 ON = Scanner 3
3 ON = Scanner 4
3 & 1 ON = Scanner 5
3 & 2 ON = Scanner 6
3 & 2 & 1 ON = Scanner 7
4 ON = Scanner 8
4 & 1 ON = Scanner 9
4 & 2 ON = Scanner 10
4 & 2 & 1 ON = Scanner 11
4 & 3 ON = Scanner 12
A small slotted screwdriver or
paperclip works well; avoid pencils.
4 Repeat steps 1 through 3 for each I/O
expansion rack.
Then, for each I/O expansion rack,
insert the Scanner Module
immediately to the right of the Power
Supply, and secure it in place with the
two captured screws in the faceplate.
Step Procedure Comments/References
5 I/O will be installed later. See Page 78.

I/O Module Installation and Wiring
Overview
This section contains descriptions of and procedures for installing I/O Modules in controller racks
(C30/C30S, C50/C50S, C70/C70S, models) and in I/O expansion racks (S50/S50S, S75/S75S only).
Module Placement in Racks
Each input or output module is placed in an I/O slot in a rack as shown in Figure 37.
Each “slot” in a rack includes a set of guides that locate the circuit board in the rack and a 20-pin (4 x 5)
socket in the backplane that receives the associated 4 x 5-pin plug at the back of the I/O module.
At the front of each I/O module, a 20 or 36 pin plug receives the associated socket on the back of a terminal
block. When the I/O module is inserted into the rack and the terminal block is placed on the circuit board,
two captured screws in the terminal block are fastened to metal tabs on the rack.
Figure 37 – I/O Module Installation
Do not use an input/output terminal block if the terminal block is damaged, if the door is
missing, or if one or both mounting screws are missing.
Always tighten both terminal block screws to proper torque settings before applying field
power to the module. Torque to 0,4 - 0,5 Nm (3.5 – 4.4 Lb-In.)
Do not apply energized (“live”) field wiring to an input/output module that is not installed in
one of the racks in the HC900 Controller.
Do not operate the controller without a Protective Earth connection.
Failure to comply with these instructions could result in death or serious injury.
Terminal Block Styles
The terminal block is available in the barrier style, shown at
left in Figure 38, 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 38 – 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.
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 Module Installation Procedures, page 84.
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.