Option module and capacity considerations
The controller supports a maximum total of four option (expansion) modules in certain combinations.
If you use two RS485 option modules, you are limited to one additional non-RS485 module (LON or RS-232) for a total of three modules. The following figure shows some example combinations.
Figure 2. Valid module combinations
Maximum option modules supported by protocol
| Expansion Module | Max Components |
|---|---|
| NPB-8000–LON | 4 |
| NPB-8000–232 | 4 |
| NPB-8000–2X-485 | 2 |
Separate maximum limits may be defined in the controller’s license, such as total number of networks, devices, and integration points (capacity licensing).
Maximum wired field bus integrations
| Protocol | Maximum | Description, Option Module |
|---|---|---|
| RS485 | 7 | Two via onboard RS485, four via two Dual RS485 option modules (2 ports each), plus one via LON or RS-232. |
| Lonworks FTT-10 | 4 | Four LON option modules (1 port each module) |
| RS232 | 4 | Four RS-232 option modules (1 port each module) |
The maximums above do not reflect combinations of wired field bus integrations. Two examples:
- Two RS485 modules (via onboard RS485), two Lonworks FTT-10 (2 LON modules), two RS-232 modules. In these configurations, the maximum number of option modules (4) are installed.
- Four RS485 (two via onboard RS485, two from a single Dual RS485 module), two Lonworks FTT-10 (two LON modules). In this case, three (3) option modules are installed.