Allen-Bradley devicenet modules in logix5000 control systems Manual Do Utilizador
Publication DNET-UM004A-EN-P - March 2004
Using POINT™ I/O Modules on a DeviceNet Network 15-3
Tally Memory
Requirements
Requirements
POINT I/O modules connect to an adapter or interface module. To
tally their memory requirements:
tally their memory requirements:
POINT I/O 1734-ADN or 1734-ADNX Adapter
The ADN/ADNX adapter creates a small network (subnet) out of the
modules and devices that are connected to it. You can configure the
adapter to give each device on the subnet its own DINT or DINTs,
which works best for a Logix5000 system.
modules and devices that are connected to it. You can configure the
adapter to give each device on the subnet its own DINT or DINTs,
which works best for a Logix5000 system.
To tally the memory requirements for POINT I/O:
For this module:
See page:
P
O
I
N
T
I/
O
O
P
O
I
N
T
I/
O
O
A
D
D
N
subnet
4
Device
Input Size of
Device
(bytes)
Input Memory
in Scanner
(DINTs)
Output Size of
Device
(bytes)
Output Memory
in Scanner
(DINTs)
Point I/O adapter-ADN
2
1
2
1
Point I/O input-IE2C
6
2
0
0
Point I/O output-OB4E
1
1
1
1
Total
4
2
Device
Address
Input Size of
Device
(bytes)
Input Memory
in Scanner
(DINTs)
Output Size
of Device
(bytes)
Output Memory
in Scanner
(DINTs)
start/stop buttons
1
1
1
1
motor starter
4
1
4
1
POINT I/O adapter w/ modules
4
2
1. Determine how many bytes each device sends and/or gets to/from your control system.
The adapter itself sends 2 bytes and gets 2 bytes.
2. Convert the input and output sizes to DINTs in the scanner.
3. Add the totals to the main tally.
sub-tally
main tally