Specifications

Theory of Operation

31007715 6/2008

As you plan and assemble the island bus, make sure that you choose and insert the

correct base in each location on the island bus.

I/O Each segment contains a minimum of one Advantys STB I/O module. The maximum

number of modules in a segment is determined by their total current draw on the

5 VDC logic power supply in the segment. A built-in power supply in the NIM

provides 5 VDC to the I/O modules in the primary segment. A similar power supply

built into the BOS modules provides 5 VDC for the I/O modules in any extension

segments. Each of these supplies produce 1.2 A, and the sum of the logic power

current consumed by all the I/O modules in a segment cannot exceed 1.2 A.

The Last Device

on the Primary

Segment

The island bus must be terminated with a 120 Ω terminator resistor. If the last

module on the island bus is an Advantys STB I/O module, use an STB XMP 1100

terminator plate at the end of the segment.

If the island bus is extended to another segment of Advantys STB modules or to a

preferred module (see p. 19), you need to install an STB XBE 1000 EOS bus

extension module in the last position of the segment that will be extended. Do not

apply 120 Ω termination to the EOS module. The EOS module has an IEEE 1394-

style output connector for a bus extension cable. The extension cable carries the

island’s communications bus and auto-addressing line to the extension segment or

to the preferred module.

If the island bus is extended to a standard CANopen device (see p. 18), you need to

install an STB XBE 2100 CANopen extension module in the rightmost position of the

segment and apply 120 Ω termination to island bus after the CANopen extension

module—use the STB XMP 1100 terminator plate. You must also provide 120 Ω

termination on the last CANopen device that is installed on the island bus.

Remember that you cannot use extensions when a basic NIM is in the primary

segment.

STB XBA 2100 18.4 mm (0.72 in) the size 2 base that supports an auxiliary power

supply

STB XBA 2200 18.4 mm (0.72 in) the size 2 base that supports the PDMs

STB XBA 2300 18.4 mm (0.72 in) the size 2 base that supports BOS modules

STB XBA 2400 18.4 mm (0.72 in) the size 2 base that supports EOS modules

STB XBA 3000 28.1 mm (1.06 in) the size 3 base that supports many of the special

modules

Base Model Base Width Advantys STB Modules It Supports

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