Series-C I/O modules are constructed to support normal field failures, wiring errors and conditions such as a shorted wire. All Series-C IOTAs contain at least one fuse that provides protection for catastrophic errors in the IOTA, IOM and other elements of the Series-C system. In normal operation as well as many abnormal operations, the fuse element should not blow.
There are two types of digital output points:
l status output (SO) - the default type, and
l on-pulse output (ONPULSE)
ATTENTION
Normally Open (NO), Normally Closed (NC), and RTN are provided for four relay contacts for
customized configurations. You must use appropriately rated fuses in the relay output."
The DOTYPE parameter determines the output type. The status and on pulse output types are for
digital outputs that are connected to device control blocks.
Actual output action can be any one of the following depending on the configuration of the device
control point.
l status or
l latched
The SP - DO channel block supports multiple interlock checks prior to DO change. Eight interlock
check parameters are available and are set to 'OFF' by default. The interlock check parameters can
be connected with any one of the following flags.
l PV and PV.FLWRST of any DI Channel block of the same SP IOM only.
l XXXX. FL, where XXXX can be any one of - VOTPVxHIALM, VOTROCxPOSHIALM,
VOTPVxHHALM or VOTROCxPOSHHALM - x=1 and 2, of local SP - SPDVOTE channel.
l XXXX. FLWRST, where XXXX can be any one of VOTPVxHHALM or VOTROCxPOSHHALM - x=1
and 2, of local SP - SPDVOTE channel.
l YYYY. FL, where YYYY can be any one of PVHIALM, ROCPOSHIALM, PVHHALM or
ROCPOSHHALM of local SP - SPEED channel.
l YYYY. FLWRST, where YYYY can be any one of PVHHALM or ROCPOSHHALM of local SP -
SPEED channel.
ATTENTION
l The interlock parameters (I1 to I8) that are not connected are not used for interlock
processing.
l The response time of the DO trip achieved using the interlock configuration is faster
than that of the alarms reported using any function blocks such as FLAG or DIGACQ
blocks. Hence, the TripValue displayed in the Station for the Data Acquisition Block
alarms and the PV at the time when the DO was tripped may not necessarily be
same.
l LastTripReason parameter does not hold the value when the SPM power cycle
happens. To retain the LastTripReason value, perform the following:
1. connect the alarm flags that are configured as interlocks to a FirstOut block
2. Use the same alarm flags for determining the interlock, which caused the trip in
SPM.
