ABB CT92474A Operating mode bus board

Description

In applications where a Harmony Repeater is used, the con

troller uses a default bus length of 1200 meters after the ini

tialize/format special operation 0x02 = 0000010. If the default

bus length of 1200 meters is being used then no additional

special operation is required after special operation

0x02 = 0000010; that is, special operation 0x10 = 0010000 is

not performed since it is the default (Table 3-4).

Additional proptime special operations can select one of four

proptimes (Table 3-4). The redundant controller must have the

same proptime special operation performed before its startup.

The proptime is measured at startup by both the primary and

redundant controllers. These additional proptimes allow

remote Harmony block I/Os to be located up to 3000 meters

from the local controller.

The redundant controller will red light with a

0x16 = 00010110 = LEDs 2, 3, and 5 special operation when

the selected proptime does not match the measured proptime

of the current bus master (primary controller). The configura

tion download via the redundancy link contains the primary’s

format information and stores the configured proptime in the

redundant’s format information during the download.

The block I/O uses a default bus length of 1200 meters at

startup. With Harmony block I/O firmware release E.0 or later,

the default proptime is overridden at startup when a controller

is already online and the block I/O detects a bus master

(primary controller). The proptime is then set to the measured

value to prevent a conflict. The block I/O performs a back

ground proptime check once a second. A sequential counter is

started when a valid measured value is different than the cur

rent selected value. The proptime is set to the new measured

value if the measured value remains the same for five sequen

tial checks (five seconds).

This mode of operation permits the bus to be in a nonfunc

tional state when proptime is changed for up to five seconds

after the controller has started the Hnet interface as a control

ler type. This is an acceptable state because the bus had been

previously stalled; that is, a special operation on the primary

controller with the redundant controller removed. Again, the

primary controller can change its proptime only via a special

operation and the redundant controller must be offline before

inserting the primary controller with the new proptime. The

tens digit of the FC 89 block output #31999 on the controller

reports the configured bus distance.

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