Honeywell LV RTP Cable (32/16 channel) (1.0M, 3.28ft) Note 6 (NOT FOR SIL2 SYSTEMS) 900RTC-3310
NOTE: In the diagram below, the white cut-outs represent the cut-outs on the modules that
accommodate tabs on the Terminal Block. That is, all key-tabs that line up with the white cut outs on
the diagram should be retained, and all other tabs should be removed.
The orientation of the diagrams below corresponds to the picture of the terminal block, shown in
the previous picture.
Diagrams for I/O Module Key-Tabs
Step Procedure Comments Reference
5 If installing High Level 16 channel Analog Input module, set its SW1 and SW2 DIP switches to
ON. This connects an internal 250 ohm resistor.
A small slotted screwdriver or paperclip works well; avoid using pencils.
6 If installing 8- or 16-channel Analog Output module, set its DIP switch as follows. (Switch is
located at edge of module, marked “SW1”.)
For internal rack power, set DIP switch to ON.
For external power (18-36V), set DIP switch to OFF (default).
Note: 24VDC external power is required if using 6 or more 8-pt. AO modules or 3 or more 16-pt.
AO modules.
A small slotted screwdriver or paperclip works well; avoid using pencils.
8-16 Analog output Channels require loop power for open loop detection
Step Procedure Comments Reference
7 If installing a PFQ module, set its Input 1, Input 2 and Index DIP switches to differential or single
ended mode. Inputs mode need not match index mode. See below for switch positions.
Switch location on PFQ module:
Settings (using Input 1 as example)
Single ended (factory setting):
1 and 2 (SINGLE) = ON, 3 and 4 (DIFF) = OFF
Differential:
1 and 2 (SINGLE) = OFF, 3 and 4 (DIFF) = ON
Step Procedure Comments Reference
8 Connect wire-tie into the
top and/or bottom of the
Rack.
Form a bend in each wire
to provide strain relief, and
secure the wire bundle
with the tie.

Step Procedure Comments Reference
9 Install I/O modules in
racks. Be sure to follow
placement guidelines
under Heat Rise De-rating
page 52.
10 Install I/O module, install
appropriate terminal block.
11 In each slot location not
occupied by an I/O
module, install a Filler
Block cover, Part number
900TNF-0001.
Note: The Filler Block Cover looks much like an I/O Terminal
Block assembly, except that it does not include the wire
terminating block (screw terminals). The Filler Block mounts in
the same manner as a Terminal Block (with captured screws at
top and bottom). Blank labels are provided for mounting in the
hinged door.
I/O Terminal Block Wiring Diagrams
Universal Analog Input Module Wiring
The Universal Analog Input Module has eight inputs, which can include any combination of the following
input types: RTD, TC, Ohms, Millivolt, Volt, or Milliamp. Figure 43 shows wiring examples of each of the
analog input types. An example of wiring for eight TC inputs is given in Figure 45.
Specifications for this module and for other modules are given in the Specifications section of this manual.
ATTENTION
To indicate sensor failure the Analog Input software will output a warning if
thermocouple resistance > 80 ohms. Use appropriate gauge wiring to prevent
inaccurate failure warnings.
Table 15 – Typical Thermocouple resistance in Ohms per Double Foot @ 68 degrees F
AWG No. Diameter
inches
Type K Type J Type T Type E Type S
Pt/ PT110
Type R
Pt/ PT113
Type W5/
W26
Type W/
W26
10 0.102 0.058 0.034 0.029 0.069 0.018 0.018 0.023 0.020
12 0.081 0.091 0.054 0.046 0.109 0.028 0.029 0.037 0.031
14 0.064 0.146 0.087 0.074 0.175 0.045 0.047 0.058 0.049
16 0.051 0.230 0.137 0.117 0.276 0.071 0.073 0.092 0.078
18 0.040 0.374 0.222 0.190 0.448 0.116 0.119 0.148 0.126
20 0.032 0.586 0.357 0.298 0.707 0.185 0.190 0.235 0.200
24 0.0201 1.490 0.878 0.7526 1.78 0.464 0.478 0.594 0.560
26 0.0159 2.381 1.405 1.204 2.836 0.740 0.760 0.945 0.803
30 0.0100 5.984 3.551 3.043 7.169 1.85 1.91 2.38 2.03
Table values are shown as a reference only; actual values may vary. Consult manufacturer specifications.
Isolation
This module has eight inputs, which are isolated except for RTD current sources.
RTD Inputs
RTD inputs share current sources (two RTD inputs per source), as shown in
Figure 42, Figure 43, and Figure 44.
For example, the current source for the RTD input at channel one (terminals 1 and 2) is terminal 3 (IRTD 1 &
2). This same current source (IRTD 1 & 2) is also used for an RTD input at channel two (terminals 4 and 5).
OHMs Inputs
Ohms inputs are wired similar to 2-wire RTD inputs. That is, they require a current source, and thus must
use one of the IRTD current sources. Also, two terminals are jumpered together as they are for two-wire
RTD inputs.
Analog channels wired for Ohms inputs differ from RTD inputs in these aspects:
Ohms inputs connect to variable resistance devices other than RTDs, and
Ohms inputs are configured in Designer Software as Ohms inputs, rather than as RTD inputs.
Examples of wiring for resistance inputs are given in Figure 46 .
Shield Grounding
Shields must be grounded as described under Shield Grounding at the beginning of this section.
Hazardous voltages exist at terminal blocks.
Using switches at field devices disconnect the field wiring from power sources before servicing.
Failure to comply with these instructions could result in death or serious injury.
16 point High Level Analog Input Wiring (Figure 49)
Be sure to set the module DIP switches for voltage or current mode. See page 87. This requires Low
Voltage Euro style 36-terminal terminal block.
Note: Unused input channel shall not be left open for 900A16-0102 IO module