Allen-Bradley ProcessLogix 1756-IA16, Reference Manual, Page: 51 / 120

Publication 1757-RM810A-EN-P - May 2002
Functional Blocks 3-11
AOCHANNEL
DICHANNEL
Description Provides a standard analog output signal for operating final control elements.
Function
•
Brings OP data from connected blocks and conveys OP data to be stored in an associated IOM block.
•
Sets INITVAL parameter to appropriate value based on echo data.
•
Assigns safe value if STS parameter is BAD or UNCERTAIN.
•
Sets INITREQ to TRUE value if AOC or IOM block is inactive or a communications error occurs.
Inputs Only one control block can interface to this block.
Outputs Floating point value in engineering units.
Associated
Block Prior to loading, block must be “associated” with 1 channel of corresponding IOM block that interfaces with physical
AO hardware module at execution runtime.
Parameters BACKCALCOUT
BADCAL
BADCODE
CALBIAS
COMMFAILFL DEBUG
EXECCOUNT
FETCHMODE
FREEZETIME
IOCNUMBER INITREQ
INITVAL
IOCSTATE
IOCTYPE
IOMCONN OP
OPFINAL
OPSOURCE
ORDERINCM
UPDATOPT
Description Provides a standard digital interface to control blocks.
Function
•
Brings PV data from an associated IOM block.
•
Assigns Bad status to PV parameter when appropriate
Inputs Digital (PV) signals received from the field.
Outputs PV status value that can be used by other data points in system.
Associated
Block Prior to loading, block must be “associated” with 1 channel of corresponding IOM block that interfaces with physical
Digital Input hardware module at execution runtime.
Parameters BADCODE
BADPV
COMMFAILFL
COS
DEBUG
EXECCOUNT FETCHMODE
FREEZETIME
HWFAULT
INBADOPT
IOCNUMBER
IOCSTATE IOCTYPE
IOMCONN
NOFIELDPWR
ORDERINCM
PVFL PVSTS
PVVAL
PVVALSTS
UPDATOPT
WIREOFF
Spare Allen-Bradley Parts