Topic: CL234
| Communications Ethernet |
Topic: CL234
|
The CLICK PLC communicates over Ethernet using the TCP and UDP protocols. The port numbers used by CLICK are listed in the table below. This information is sometimes necessary for firewalls and router NAT tables.
|
Application |
CPU or Option Slot Modules |
Port Number
|
TCP or UDP |
Configurable |
On by Default |
|
Modbus TCP Server |
CPU |
502 |
TCP |
Yes |
Yes |
|
Modbus TCP Client |
CPU |
502 |
TCP |
Yes |
Yes |
|
CLICK Programming Software |
Both |
25425 |
UDP |
No |
Yes |
|
EtherNet/IP Class 1 Implicit |
CPU |
2222 |
UDP |
No |
No |
|
EtherNet/IP Class 3 Explicit |
CPU |
44818 |
TCP |
Yes |
No |
|
DNS (Domain Name Server) |
Both |
53 |
UDP |
No |
Yes |
|
SNTP (Time) |
Both |
123 |
UDP |
No |
No |
|
DHCP |
Both |
67 |
UDP |
No |
Yes |
|
SMTP(s) (Email) |
CPU |
587 |
TCP |
Yes |
No |
|
STARTTLS (Email) |
CPU |
465 |
TCP |
Yes |
No |
|
MQTT |
CPU |
1883 |
TCP |
Yes |
No |
|
NodeRED |
Slot |
1880 |
TCP |
Yes |
No |
|
OPCUA |
Slot |
4840 |
TCP |
Yes |
No |
For TCP and UDP communications such as Modbus TCP and EtherNet/IP, there are limits to the number of “connections” allowed. Each connection has a cost in memory and performance. EtherNet/IP also has the concept of a “CIP” connection. The table below lists the limits for CLICK.
|
Application |
TCP or UDP |
Maximum Number of Connections |
||||
|
C0-1x Ethernet CPUs |
C2-01CPU(-2) |
C2-02CPU(-2) |
C2-03CPU(-2) |
|||
|
Port1 |
Port1 |
WLAN |
Port1 |
WLAN |
||
|
Modbus TCP Server |
TCP |
3 |
3 |
3 |
3 |
3 |
|
Modbus TCP Client |
TCP |
4 |
4 |
4 |
4 |
4 |
|
EtherNet/IP |
|
|
|
|||
|
- TCP |
TCP |
2 |
2 |
2 |
||
|
- EtherNet/IP |
TCP |
2 |
2 |
2 |
||
|
- CIP (Common Industrial Protocol) |
Both |
4 (2 per TCP) |
4 (2 per TCP) |
4 (2 per TCP) |
||
|
DNS (Domain Name Server) |
UDP |
1 |
1 |
1 |
1 |
|
|
SNTP (Time) |
UDP |
1 |
1 |
1 (Port1 or WLAN) |
||
|
DHCP |
UDP |
1 |
1 |
1 |
1 |
1 |
|
SMTP (Email) |
TCP |
1 |
1 |
1 (Port1 or WLAN) |
||
|
MQTT |
TCP |
1 |
1 |
1 |
1 |
|
|
Unless otherwise noted, connections are independent and can be simultaneous. |
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CLICK Example for AB CompactLogix
CLICK Example for Productivity Series PLC
CLICK Example for the Do-more PLC
General & Extended Status EtherNet/IP Error Codes