Specifications

Parameters
Parameter
Name
Parameter
Type
Range of
Values
Default
Units
dig_chan Algorithm
Language channel
specifier (string)
Input channel for VT1533A: Iccc.Bb
for VT1534A: Iccc
where ccc=normal channel number and
b=bit number (include “.B”)
none
Comments
·
The duration of the level change to the designated bit or channel MUST be at
least the length of time between scan triggers. Variable and algorithm changes can
be accepted during the INPUT or UPDATE phases (Figure 6-1) when INIT is
active. All writes to variables and algorithms occur to their buffered elements
upon receipt. However, these changes do not take effect until the
ALG:UPD:CHAN command is processed at the beginning of the UPDATE phase.
Note that the ALG:UPD:WINDow command specifies the maximum number of
updates to do. If no update command is pending when entering the UPDATE
phase, then this time is dedicated to receiving more changes from the system.
NOTE As soon as the ALG:UPD:CHAN command is received, the VT1419A begins to
closely monitor the state of the update channel and can not execute other commands
until the update channel changes state to complete the update.
·
Note that an update command issued after the start of the UPDATE phase will be
buffered but not executed until the beginning of the next INPUT phase. At that
time, the current stored state of the specified digital channel is saved and used as
the basis for comparison for state change. If at the beginning of the scan trigger
the digital input state had changed, then at the beginning of the UPDATE phase
the update command would detect a change from the previous scan trigger and the
update process would begin.
·
When Accepted: Before and After INIT.
Command
Sequence
The following example shows three scalars being written with the associated update
command following. When the ALG:UPD:CHAN command is received, it will read
the current state of channel 136, bit 0. At the beginning of the UPDATE phase, a
check will be made to determine if the stored state of channel 136 bit 0, is different
from the current state. If so, the update of all three scalars take effect next Phase 2.
INIT
ALG:SCAL ‘ALG1’,’Outplimit’,25
ALG:SCAL ‘ALG1’,’Alarmtrip’,1.3
ALG:SCAL ‘ALG2’,’Alarmtrip’,1.7
ALG:UPD:CHAN ‘I136.B0’ update on state change at bit zero of 8-bit
channel 36
VT1419A Command Reference
ALGorithm
Chapter 6 201
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