Fixed I/O Chassis - I/O Module Compatibility - Allen-Bradley 1746-NT8 User Manual

OW16 and
450 (0, 455)
400
350
300
250
Current
(mA)
Valid Operating
Region
at 5V dc
200
150
x
100
50
50
Current (mA) at 24V
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.

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.
OW16 and IA16
(180, 255)
Plotted from
Example
Shown Below
150 200
Module Current Draw - Power Supply Loading
I/O Module
5V 24V
BAS .150 .040
BASn .150 .125
DCM .360 .000
FI O4I .055 .150
FI O4V .055 .120
HS .300 .000
HSTP 1 .200 .000
IA4 .035 .000
IA8 .050 .000
IA16 .085 .000
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
KE .150 .040
KEn .150 .125
* w/jumper set to rack, otherwise 0.0 mA.
Publication 1746-UM022B-EN-P - January 2005
Installing And Wiring Your Module
I/O Module 5V 24V
NI4 .025 .085
NI8 .200 .100
NIO 4I .055 .145
NIO 4V .055 .115
NO4 I .055 .195
NO4 V .055 .145
120
N08I 250*
N08V 120 160*
NR4 .050 .050
100 55
NR8
NT4 .060 .040
120 70
NT8
OA16 .370 .000
OA8 .185 .000
OAP 12 .370 .000
OB8 .135 .000
OB16 .280 .000
OB16E .135 .000
OB32 .452 .000
OBP8 .135 .000
OBP16 .250 .000
OG16 .180 .000
OV8 .135 .000
OV16 .270 .000
OV32 .452 .000
OVP 16 .250 .000
OW16 .170 .180
OW4 .045 .045
OW8 .085 .090
OX8 .085 .090
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