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Processing capacities of Modicon platforms
Processing capacity
The table below can be used to compare, for each station, the total number of
messages received via the Modbus (or Uni-TE) messaging service, if used, (value
R1, R2 or Ri) with the capacity of the station processor.
Processing of Modbus requests per PLC scan cycle
Modicon M340, Modicon Premium platforms
Messages received
Total messages received by the
PLC from all the communication
modules
(1)
TSX P57 10
4
messages/cycle
BMX P34 20 / TSX P57 20
8
messages/cycle
TSX P57 30
12
messages/cycle
TSX P57 40
16
messages/cycle
TSX P57 50/60
(2)
16/20
messages/cycle
Modicon
Quantum
platform
Integrated port limitations Communication module
limitations
Ethernet
modules
per PLC
All types of
communication
request
Additional
read/write 4x
registers
All types of
communication
request
Additional
read/write 4x
registers
140
CPU 113
(3)
–
–
1
message/
cycle
4
messages/
cycle
2
max.
140
CPU 311
–
–
1
message/
cycle
4
messages/
cycle
2
max.
140
CPU 434
140
CPU 534
(3)
–
–
4
messages/
cycle
8
messages/
cycle
6
max.
140
CPU 651
16
messages/
cycle
16
messages/
cycle
4
messages/
cycle
8
messages/
cycle
6
max.
Messages/cycle:
number of messages received per scan cycle from the PLC master task
(
typical cycle of 50 to 100 ms)
Example:
Modicon Quantum
140
CPU 434 12
p
processor with 4 Ethernet
140
NOE 771
p
1
modules:
- 20
messages/cycle for all types of communication request, and
- 32
messages/cycle for the read/write 4x registers
Ethernet transaction processing capacity
For each station, compare the total number of messages received
[
values Ri, Rj]
and the total number of messages transmitted
[
values Ei, Ej] (for station N, for
example) with the Ethernet transaction processing capacity shown below.
Use the following elements for the Ethernet connection per PLC, rather than the
number of transactions required by the application.
Ethernet transaction
processing capacity
Modicon M340 BMX
Modicon Premium TSX
Modicon Quantum 140
NOE 0100
NOE 0110
NOC 0401
NOR 0200H
P34 2020
P34 20302
ETY 110WS ETY 4103/5103
WMY 100
ETC 101
P57 10...40
P57 50
P57 60
NOE 771 00/10
NOE 771 01/11
NWM 100 00
NOC 771 01
CPU 651 50/60
CPU 652 60
Modbus messaging
500
transactions/s
500
transactions/s
60
transactions/s 450
transactions/s
500
transactions/s
350
transactions/s
350
transactions/s
I/O Scanning service
2,000
transactions/s
Server mode
(4)
Service not
available
2,000
transactions/s
(5)
2,000
transactions/s
2,000
transactions/s
(5)
2,000
transactions/s
Global Data
subscription
800
Service not
available
Service not
available
800
(6)
800
800
(6)
800
(1)
A temporary overload, due for example to an adjustment terminal or the temporary connection
of an Internet browser, lasting for a few PLC scans, is permissible.
(2)
Only with Unity Pro software.
(3)
Only with Concept/ProWORX software.
(4)
BMX P34 20
ppp
processors with Modbus TCPmessaging in server mode can be scanned by
a device that has the I/O Scanning service.
(5)
TSX WMY 100
and
140
NWM 100 00
modules do not have the I/O Scanning service.
(6)
TSX WMY 100, TSX ETC 101, 140 NWM 100 00
and
140
NOC 771 01
modules do not have
the Global Data service.
Performance
(
continued)
Modicon Premium automation
platform
Ethernet Modbus/TCP network
Performance
2
1
3
4
5
6
7
8
9
10