Allen-Bradley ProcessLogix 1756-IA16, Reference Manual, Page: 26 / 120

Publication 1757-RM810A-EN-P - May 2002
2-6 Physical Equipment Blocks
1756-IA8D
8-Channel - 120Vac Diagnostic Input
Description Identifies the physical IOM for the CPM to provide links to associated IOC and provides selected diagnostic
information for associated channels.
Function
•
Defines type of IOM, number of channels, execution state, and communications path for data.
•
Supports the following diagnostics, which are user configurable for each channel:
– Open Wire Detection: Senses when current input for a given channel falls below a certain value. When an
input uses dry contacts, you must include a bleed resistor in the input. You may not need a bleed resistor for
solid state contacts.
– Loss of Field Power: Senses when field power of a group of channels is lost.
•
Provides link to IOC through IO manager software resident in the CPM.
•
Executes once every cycle.
•
Includes IOC assignment to one of 8 channels (points), as part of IOM configuration.
Inputs Real-time data transmission from physical device.
Outputs Real-time data transmission to configured IOC.
Parameters ALMENBSTATE
ASACONNSTS
ASAERRCODE
ASAERRINFO
CATNUMBER
CEESTATE
CHANTEXT
DESC
DLCNBSLOT
ESTWEIGHT EUDESC
EXECSTATE
HIALM
INALM
IOMSLOT
IOMTYPE
KEYWORD
MAJORREV
MINORREV
NUMCHANS NUMCONN
NUMDISCONN
NUMSHUTDOWN
ORDERINCEE
ORDERINCM
PERIOD
PHASE
PRODTYPE
SCANAREA
SCANASSOCDSP SCANCTRLLVL
SCANEUHI
SCANEULO
SCANGRPDTL
SCANPNTDTL
ULCNBMAC
UPDATOPT
VENDOR