Rockwell-automation 1734-SSI POINT I/O Synchronous Serial Interface Ab Manual de usuario descargar pdf (Pagina 33)

Publication 1734-UM007D-EN-P - December 2005

Set and Operate Your Module 4-5

Comparators 1 and 2

You can store two separate four-byte values and be notified when the

SSI sensor attains or exceeds the stored value. Comparators 1 and 2

are mutually exclusive: only one comparator can be active at any

given time.

You can set a comparator to trigger on an increasing sensor count,

decreasing count, or regardless of sensor direction, by choosing Both

for the comparator control value. There are two modes of comparator

operation: manual and automatic. The green COMP LED on the front

of the module illuminates when a comparator value is reached. The

LED goes OFF when comparator reset occurs.

See the table for a listing of values for DeviceNet name, RSLogix 5000

tag, and RSLogix 5000 field name for Manual and Automatic mode.

Manual Mode

Select Manual mode by entering a comparator value and a

corresponding control value (increasing, decreasing, or both). If you

are using Comparator 2, for example, you notice Bit 7 of Status Byte 0

(C2ST) is 1 when Comparator 2 is active. To reset the comparator,

toggle (set to 1 for at least 0.5 ms, then back to 0) the Comparator 2

acknowledge bit, Bit 2 of the Master Ack Byte (CC2).

You can also reset Comparator 2 by turning it OFF through the

configuration. Comparator 1 uses Bits 6 (C1ST) and Bit 4 (C1R) of

Status Byte 0 for operation. Bit1 (CC1) of the Master Ack Byte is used

for reset. Like Comparator 2, you can also reset Comparator 1 by

turning it OFF through the configuration.

Manual and Automatic Mode

DeviceNet Name RSLogix 5000 Tag RSLogix 5000 Field Name

C1ST Input Compare0Status

C2ST Input Compare1Status

CC1 Output Compare0Ack

CC2 Output Compare1Ack

C1R Input Compare0Reached

C2R Input Compare1Reach

SCMP1 Output Compare0Select

SCMP2 Output Compare1Select

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 52 53

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Rockwell-automation 1734-SSI POINT I/O Synchronous Serial Interface Ab Manual de usuario Pagina 33