Automationdirect.com DL06, User Manual

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DL06 Micro PLC User Manual, 3rd Edition, Rev. E
5-244
Chapter 5: Standard RLL Instructions
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Hi/Low Alarm - BCD (HILOAL) (IB-421)
Hi/Low Alarm - BCD monitors a BCD value V-Memory location and sets four possible
alarm states, High-High, High, Low, and Low-Low whenever the IBox has power flow.
You enter the alarm thresholds as constant K BCD values (K0-K9999) and/or BCD value
V-Memory locations.
HILOAL Parameters
• Monitoring Value (BCD): specifies the V-memory location of the BCD value to be monitored
• High-High Limit: V-memory location or constant specifies the high-high alarm limit
• High-High Alarm: On when the high-high limit is reached
• High Limit: V-memory location or constant specifies the high alarm limit
• High Alarm: On when the high limit is reached
• Low Limit: V-memory location or constant specifies the low alarm limit
• Low Alarm: On when the low limit is reached
• Low-Low Limit: V-memory location or constant specifies the low-low alarm limit
• Low-Low Alarm: On when the low-low limit is reached
DS Used
HPP
N/A
Parameter DL06 Range
Monitoring Value (BCD) V See DL06 V-memory map - Data Words
High-High Limit V, K K0-9999; or see DL06 V-memory map - Data Words
High-High Alarm X, Y, C, GX,GY, B See DL06 V-memory map
High Limit V, K K0-9999; or see DL06 V-memory map - Data Words
High Alarm X, Y, C, GX,GY, B See DL06 V-memory map
Low Limit V, K K0-9999; or see DL06 V-memory map - Data Words
Low Alarm X, Y, C, GX,GY,B See DL06 V-memory map
Low-Low Limit V, K K0-9999; or see DL06 V-memory map - Data Words
Low-Low Alarm X, Y, C, GX,GY, B See DL06 V-memory map
You must ensure that threshold limits are valid,
that is HH >= H > L >= LL. Note that when the
High-High or Low-Low alarm condition is true,
that the High and Low alarms will also be set,
respectively. This means you may use the same
threshold limit and same alarm bit for the High-
High and the High alarms in case you only need
one “High” alarm. Also note that the boundary
conditions are inclusive. That is, if the Low
boundary is K50, and the Low-Low boundary
is K10, and if the Monitoring Value equals 10,
then the Low Alarm AND the Low-Low alarm
will both be ON. If there is no power flow to
the IBox, then all alarm bits will be turned off
regardless of the value of the Monitoring Value
parameter.