Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual - Manual (Page 21)

Publication 1746-UM022B-EN-P - January 2005
Installing And Wiring Your Module 2-3
Fixed I/O Chassis - I/O Module Compatibility
The following chart depicts the range of current combinations
supported by the fixed I/O expansion chassis. To use it, find the
backplane current draw and operating voltage for both modules being
used in the chassis. These specifications are found in the table
alongside the chart.
Next, plot each of the currents on the chart below. If the point of
intersection falls within the operating region, the combination is valid.
If not, the combination cannot be used in a 2-slot, fixed I/O chassis.
Module Current Draw - Power Supply Loading
5V 24V I/O Module 5V 24V
BAS .150 .040
KE .150 .040
BASn .150 .125
KEn .125
DCM .360 .000
NI4 .025 .085
FI O4I .055 .150
NI8 .200 .100
FI O4V .055 .120
NIO 4I .055 .145
HS .300 .000
NIO 4V .055 .115
HS TP 1 .200 .000
NO4 I .055 .195
IA4 .035 .000
NO4 V .055 .145
IA8 .050 .000 NR4 .050 .050
IA16 .085 .000
NT4 .060 .040 IB8 .050 .000
IB16 .085 .000
IB32 .106 .000
IC 16 .085 .000
IG 16 .140 .000
IH16 .085 .000
IM4 .035 .000
IM8 .050 .000
IM16 .085 .000
IN16 .085 .000
IO 4 .030 .025
IO 8 .060 .045
IO 12 .090 .070
ITB16 .085 .000
ITV16 .085 .000
IV8 .050 .000
IV16 .085 .000
IV32 .106 .000
O A16 .370 .000
O A8 .185 .000
O AP 12 .370 .000
O B8 .135 .000
O B16 .280 .000
O B16E .135 .000
O B32 .452 .000
O BP8 .135 .000
O BP16 .250 .000
O G16 .180 .000
O V8 .135 .000
O V16 .270 .000
O V32 .452 .000
O VP 16 .250 .000
O W16 .170 .180
O W4 .045 .045
O W8 .085 .090
O X8 .085 .090
50
100
150
200
250
300
350
400
450
50 150 200
x
OW16 and IA16
(180, 255)
Plotted from
Example
Shown Below
Current
(mA)
at 5V dc
Current (mA) at 24V
100
OW16 and
(0, 455)
Valid Operating
Region
.150
N08I 120 250*
N08V 120 160*
NT8 120 70
NR8 100 55
I/O Module
Example: Plot IN16 and NIO4V
IN16 = 0.085 at 5V dc and 0A at 24V dc
NIO4V = 0.055A at 5V dc and 0.115A at 24V dc
1. Add current draws of both modules at 5V dc to get
0.14 A (140 mA).
2. Plot this point on the chart above (140 mA at 5V dc.
3. Add current draws of both modules at 24V dc to get
0.115 A (115 mA).
4. Plot current draw at 24V dc (115 mA at 24V dc).
5. Note the point of intersection on the chart above
(marked x). This combination falls within the valid
operating region for the fixed I/O chassis.
Important: The 1747-NO4I and 1746-NO4V analog
output modules may require an external power
supply.
* w/jumper set to rack, otherwise 0.0 mA.