Concurrent C-more Connection Limits |
Topic: CM524 |
One of the major benefits of Ethernet connectivity is the ability to have more than 1 network master (Client) communicating to a PLC or device. A common question that arises when using C-more (since it is a network master on most of theProtocolsthat it supports) is how many C-mores can be concurrently connected to 1 device?
The answer to this question is: it depends…
There are many factors that affect the answer of how many C-mores that can be concurrently connected to an Ethernet device. If the Protocol being used is over TCP, most devices will have a TCP connection limit. The resources of the Ethernet device are a factor. The PLC scan time (assuming the device is a PLC) will be a major factor. And the rate at which C-more sends requests (“Poll Time” field inC-more Programming Software Panel Manager) can be a tremendous factor.
As you can tell from the information above, the number of concurrent C-mores that can be successfully connected to a device is very application specific. But to give a general idea of what can be achieved; several tests were run with C-more to its supported PLC on Ethernet and the results are posted in the table below. The PLC were running almost no logic in the tests performed in the table below so the scan times were much faster than what would be normal in most applications. Unless otherwise noted, the C-more projects were configured for a 0 poll rate which means that it will send requests as fast as it can (when not busy doing other things).
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Note: The results noted below may not be typical for your application. The chart below should be used as a guideline and not a specification for your system. It is also important to note that even when successfully achieving the number of concurrent connections shown in the table below, the update and performance of your project running on the C-more panel may not be acceptable for your application. Additional optimizations in your C-more project and/or PLC project may be needed. |
| Protocol | PLC Used in Test | # C-more Panels Connected | Notes |
|---|---|---|---|
| AutomationDirect ECOM Ethernet (DL05/06/205/405) | DL260 & H2-ECOM100 | 32 | Use an increased Poll rate of 100ms |
| AutomationDirect Productivity3000 (P3-550) | P3-550 | 32 | — |
| Allen-Bradley EtherNet/IP Client (MicroLogic 1100) | (1100) 1763-L16BWA | 16 | — |
| Allen-Bradley EtherNet/IP Client (MicroLogic 1100) | (1400) 1766-L32BXBA | 16 | — |
| Allen-Bradley EtherNet/IP Client (SLC5/05/ENI Adapter) | (SLC 5/05) 1747-L551-L551 FRN10 | 28 | — |
| Allen-Bradley EtherNet/IP Client (SLC5/05/ENI Adapter) | (SLC 5/05) 1747-L552 FRN8 | 20 | — |
| Allen-Bradley EtherNet/IP Client (SLC5/05/ENI Adapter) | (ENI) 1761-NET-ENI | 4 | — |
| Allen-Bradley EtherNet/IP Client (Control/CompactLogix) | *(Control) 1756-L61A | 32 | Use an increased Poll rate of 100ms |
| Allen-Bradley EtherNet/IP Client (Control/CompactLogix) | (Compact) 1769-L35E | 32 | —
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| Entivity Modbus TCP/IP Ethernet (H2-WinPLC) | H2-WPLC2 | 20 | Use an increased Poll rate of 100ms |
| Siemens S7-200 (Ethernet:ISO over TCP/IP) | CPU226 & CP243-1 | 8 | — |
| Siemens S7-300 (Ethernet:ISO over TCP/IP) | CPU319-3 | 32 | — |
| Mitsubishi Q/QnA Ethernet | Q12HCPU & QJ71E1-100 | 16 | — |
| Omron CS/CJ FINS Ethernet | CJ1H CPU65H & ETN21 | 32 | Station #8 reserved, do not use |
| * When tested using a 1756-ENBT/A, (4) C-mores connected utilized 42% of the PLC Ethernet Module "System Resource Utilization". | |||
| Device | Version |
|---|---|
| DL260 | Ver. 2.60 |
| H2-ECOM100 | Ver. 4.0.0.1456 |
| P3-550 | Ver. 1.0.7.20 |
| (1100) 1763-L16BWA | Ser. A Rev. C FRN 3 |
| (1400) 1766-L32BXBA | Ser. A Rev. A FRN 3 |
| (SLC 5/05) 1747-L551-L551 FRN10 | OS501 Ser. C FRN 10 |
| (SLC 5/05) 1747-L552 FRN8 | OS501 Ser. C FRN 8 |
| (ENI) 1761-NET-ENI | Ser. C FRN 3.01 |
| (Control) 1756-L61A | Rev. 17 |
| 1756-ENBT/A | Rev. 3.01 |
| 1756-EN2T/A | Rev. 1.003 |
| (Compact) 1769-L35E | Rev. 17 |
| H2-WPLC2 | Ver. 8.0.0.0 |
| CPU226 | Rev. 02.01 |
| CP243-1 | Rev. 0101 Hardware Rev. 1 |
| CPU319-3 | Ver. 2.4 |
| Q12HCPU | Ver. B 0911 |
| QJ71E1-100 | Ver. D 0911 |
| CJ1H CPU65H | Rev. L Soft Rev. AB |
| ETN2 | Rev. J Soft Rev. C |
