Allen-Bradley ProcessLogix 1756-IA16, Reference Manual, Page: 35 / 120

Publication 1757-RM810A-EN-P - May 2002
Physical Equipment Blocks 2-15
1756-OB16D
116-Channel - 24Vdc- Diagnostic Output
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 with the exception of the Short
Circuit Protection/Overload diagnostic, which is always enabled.
– Short Circuit Protection/Overload: Senses when current draw for a given channel is above the limit and
protects the device from damage.
– No Load/Hardware Point Fault: Senses when the output current draw falls below the threshold or a hardware
output failure occurs. It only works when the output is in the OFF state.
– Output Verification: Verifies if the actual output state matches the commanded output state for field side
verification. It only works when the output is in the ON state.
– Pulse Test: Periodically checks the output to verify that it still has the ability to change states without causing
the load to transition. (This function only operates in systems with software version R120 or greater.)
•
Provides link to IOC through IO manager software resident in the CPM.
•
Executes once every cycle.
•
Includes IOC assignment to one of 16 channels (points), as part of IOM configuration.
Inputs Real-time data transmission from configured IOC. Data is “triggered”, or is current digital (Boolean) value or pulsed
(real) value.
Outputs Real-time data transmission to physical device.
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
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