Backplane/subnet network, Data collection, Module power – Rockwell Automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters User Manual
Page 23
Publication 1738-UM001A-EN-P - February 2005
What Is the ArmorPoint DeviceNet Adapter? 2-7
Backplane/Subnet Network
On the Backplane/Subnet, your adapter acts as a scanner and is the
master of the Subnet modules. The adapter performs the following
functions:
• Exchanges I/O data with devices on the Backplane/Subnet
• Collects I/O data from the Backplane/Subnet and sends it to
devices on the DeviceNet network (e.g., scanners or controllers)
• Supplies power to the backplane I/O modules (See Appendix A
for power supply rules regarding I/O modules power
requirements.)
Data Collection
The adapter collects I/O data from up to 63 modules via the
Backplane/Subnet. The I/O modules appear on the primary
DeviceNet network as a single node, though, and require only one
DeviceNet node address.
Module Power
The adapter supplies 5V logic power to ArmorPoint I/O modules by
converting 24V dc field power to PointBus 5V power.
You can connect up to 63 I/O modules to each adapter and you can
power the backplane I/O modules from the adapter (with a maximum
of 10A of field power). You may use the integrated, isolated 24V dc
expansion power unit (1738-EP24DC) to power additional I/O
modules, as shown below.
For more information on the 1738-EP24DC expansion power unit, see
the ArmorPoint I/O 24V dc Expansion Power Supply Installation
Instructions, publication 1738-IN020.
IMPORTANT
If Automatic Device Replacement (ADR) is enabled
on the adapter, you can only connect up to 62
modules via the Subnet.
For more information on ADR, see page 2-15.
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-OB8EM12
24V dc Out
1738-ADN12
Adapter
Status
DeviceNet
Status
PointBus
Status
System
Power
Adapter
Power
DeviceNet Out
DeviceNet In
PWR
x10
x1
6
0
8
2
4
6
0
8
2
4
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-IB8M12
24V dc In
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-OB8EM12
24V dc Out
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-IB8M12
24V dc In
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-OB8EM12
24V dc Out
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-IB8M12
24V dc In
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-OB8EM12
24V dc Out
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-IB8M12
24V dc In
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-OB8EM12
24V dc Out
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-IB8M12
24V dc In
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-OB8EM12
24V dc Out
0
0
2
1
2
3
4
6
1
3
4
5
6
7
5
7
MOD
NET
1738-IB8M12
24V dc In
1738-EP24DC
24V dc Power Supply
SYSTEM
POWER
P
O
W
E
R
A
U
X
FIELD
POWER
43851
1738-ADN12 adapter
ArmorPoint I/O
modules
1738-EP24DC
expansion power unit
ArmorPoint I/O
modules