30 Rockwell Automation Publication 1734-UM007E-EN-P - October 2015
Chapter 4 Set and Operate Your Module
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, Logix Designer or
RSLogix 5000 tag, and Logix Designer or 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 Comapre0Ack
CC2 Output Compare1Ack
C1R Input Compare0Reach
C2R Input Compare1Reach
SCMP1 Output Compare0Select
SCMP2 Output Compare1Select
To Next Page
Loading...
