Issue
Some Netcontrollers support 32 I/O Modules, others only 16, how to find out what the limit is when adding more modules to an existing system.
Environment
Continuum Netcontroller CX9900, CX9940, Netcontroller II CX9680, CX9940 16IO-T X Driver
Cause
When a site is being extended by adding extra IOU Modules, it needs to be determined if the Netcontroller will support these additional modules.
Resolution
If the controller is online to Cyberstation, Edit the controller and check the value of "Max IOU Modules" on the Options tab, this will show 16 or 32.
If the controller is not online the following apply:
All Netcontroller II (CX9680) controllers support 32 IOU Modules.
All Netcontroller 1 CX9900 with 8Mb RAM support 32 IOU modules,
Most CX9940 with 4Mb RAM support 32 modules the only exception was the 4M-16I/O-T (now obsolete) that supported 16 modules.
To determine if the CX9940 is a 4M-16I/O-T, check that the Model on the right side of the unit is defined as CPU-4M also that there are no connectors for the RS485 fitted to the unit on Comm1 or Comm4 (you will see holes where the connectors are not fitted).
The CX9940 16IO/T can support an X Driver on RS232 Comm1, but no other port.
The 4M-16I/O-T and 8M-32I/OT Do not support any Infinet nodes and cannot be upgraded to support them as the required hardware is not fitted as the time of manufacture.
