Logic Configuration; Logic Equation Description; Worked Example - Reservoir Level Control - ABB SM2000 User Manual Supplement

Videographic Recorders
SM1000 and SM2000

3 Logic Configuration

3.1 Logic Equation Description

Note.
12 logic equations
Up to 6 operands and 5 operators per equation
OR/AND/NOR/XOR/NAND/NOT operators – see
Table 3.1 overleaf
Can combine internal and external digital signals – i.e.
alarms, digital inputs, other logic equation results and
real time events (timer option).
Alarm 1.1B
Alarm 1.1A
Flow Conditions
And
Fig. 3.1 Logic Equation Example
18
Or
Or
Note. Elements within each equation are calculated sequentially.
3.2 Worked Example – Reservoir Level Control –
Fig. 3.1
Note. This example uses an optional Hybrid I/O Module in
position D – see Appendix E in the User Guide (IM/SM1000
or IM/SM2000).
Channel 1.1 records the reservoir level, with an
engineering range 0 to 100 feet.
Alarms 1.1A, 1.1B and 1.2A monitor the reservoir
level.
Digital output D6 to drive the control valve from Logic
Equation 1
Digital input D1 to operate the manual override.
Alarm 1.2A
Input Elements
3 Logic Configuration
IM/SM2000ADV Issue 7