System capacities

Capacity limits for Ethernet I/O Cards

Description of EIOC capacity Limits

Fastest module scan time

100 ms

Simultaneous debug sessions

4

DSTs per EIOC

2000

Unsolicited data reporting

4000 exception reports per second

Maximum incoming unsolicited exception reports

500 per second

Maximum exception reports from one node to another node

750 per second

Write operations per node

40 per second

EIOC Object Identifiers

32,000

Physical devices per port

Dependent on the system-wide license for Ethernet connected I/O. A license can support 1, 5, 10, 20, 50, 100, or 500 devices.

When the EIOC is an OPC UA client, each port supports a maximum of 64 physical devices (if the system wide license supports at least 64 devices). For the other non-OPC UA EIOC protocols, each port supports a maximum of 256 physical devices (if the system wide license supports at least 256 devices).

Logical devices per physical device

256 maximum

EIOC signals per logical device for the following protocols:
  • Modbus TCP
  • Ethernet I/P
  • IEC 61850
  • OPC UA

100 maximum

EIOC signals per EIOC for the following protocols:
  • Modbus TCP
  • Ethernet I/P
  • IEC 61850
  • OPC UA

32768 maximum

Virtual Control Object Identifiers

16,000

Function Blocks per module

250

Nesting levels per control module

6

EIOC performance minimums

Perf_Index > 1

EIOC free memory minimum

FREMEM_INDEX > 1

Ethernet/IP Control Tag Integration protocol limits

Tags per EIOC

2000 control tags (maximum 100 array-type tags)

Tags per logical device

10 predefined or custom-type control tags or one array-type control tag

Signals per tag

  • 10 signals for predefined and custom-type tags
  • 64 non-string signals for array-type tags(1)
  • 10 string signals for array tags

Signals per EIOC

  • Predefined and custom tags only = 20,000(2)
  • Predefined, custom, and array tags = 25,400(3)
(1) An array-type tag can have a maximum of 10 string signals. The maximum string size is 40 characters.
(2) 2,000 tags x 10 signals per tag.
(3) 100 array tags x 64 signals per tag plus 1,900 non-array control tags x 10 signals per tag.