Installation guide

Commissioning

890USE17100 September 2003

Hot Swapping

Modules with the

Same Model

Number

If an I/O module is removed from its base and then replaced by another module with

the same model number, the NIM will auto-configure and auto-address the new

module with values that are identical to those of the previous module. The NIM will

then automatically put the new module in operation.

For example, say you have an island that comprises a NIM, a PDM and six I/O

modules. All these modules are optional I/O—i.e., none have been configured as

mandatory.

Suppose you have an STB DDO 3230 output module in address location 4, and it is

malfunctioning. When you remove the module from its base, as shown below, the

remaining five I/O modules in locations 1, 2, 3, 5 and 6 will continue to operate.

If you then place a new STB DDO 3230 output module in location 4, the NIM will

recognize its device profile, configure it like the old module, and start supporting all

six I/O modules the same as it did before the hot swap.

If a power cycle is performed while the module is missing, only the modules to the

left of the missing one will be operational. If you then replace the missing module,

the NIM will start supporting all six modules the same as it did before the hot swap—

there is no need to power cycle again.

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