The hardwired level control system shown below in Figure 1a must be replaced by a PLC based system. X124 V DC X2ºv 13 13 11 13 S1 E--- K1-1 S4 K2-1 K2-2 1.a.3 14 SYSTEM ON 14 LOW LEVEL 12 PUMP SYSTEM 14 PUMP 22 N SENSOR START PB 11 11 S2 E--- S5 1.a.4 12 HIGH LEVEL 12 SYSTEM SENSOR STOP PB 11 S3 1.a.4 12 13 K1-2 SYSTEM ON 14 MAX LEVEL SENSOR A1 x1 K1 SYSTEM ON H1 A2 SYSTEM ON BLUE A1 x1 K2 H2 H3 PUMP A2 PUMP RUN x2 GREEN PUMP STOP RED Figure 1a: Water Tank Level Control System a) Using the worksheets 1(a) and 1(b) sketch the PLC inputs and outputs schematic diagrams respectively. (5) b) Write/Sketch a programme using an IEC61131-3 language to implement the previously hardwired logic. (10) c) The water level sensors are replaced by an analogue ultrasonic level transducer. Explain how this transducer would replace the 'low level' and 'high level' sensors. Include what changes will be required to the PLC software. (5) d) It is proposed to replace the push buttons and lamps with a touch screen HMI. Explain how this can be achieved; include what changes would be required to the PLC program. (5)
The hardwired level control system shown below in Figure 1a must be replaced by a PLC based system. X124 V DC X2ºv 13 13 11 13 S1 E--- K1-1 S4 K2-1 K2-2 1.a.3 14 SYSTEM ON 14 LOW LEVEL 12 PUMP SYSTEM 14 PUMP 22 N SENSOR START PB 11 11 S2 E--- S5 1.a.4 12 HIGH LEVEL 12 SYSTEM SENSOR STOP PB 11 S3 1.a.4 12 13 K1-2 SYSTEM ON 14 MAX LEVEL SENSOR A1 x1 K1 SYSTEM ON H1 A2 SYSTEM ON BLUE A1 x1 K2 H2 H3 PUMP A2 PUMP RUN x2 GREEN PUMP STOP RED Figure 1a: Water Tank Level Control System a) Using the worksheets 1(a) and 1(b) sketch the PLC inputs and outputs schematic diagrams respectively. (5) b) Write/Sketch a programme using an IEC61131-3 language to implement the previously hardwired logic. (10) c) The water level sensors are replaced by an analogue ultrasonic level transducer. Explain how this transducer would replace the 'low level' and 'high level' sensors. Include what changes will be required to the PLC software. (5) d) It is proposed to replace the push buttons and lamps with a touch screen HMI. Explain how this can be achieved; include what changes would be required to the PLC program. (5)
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Transcribed Image Text:The hardwired level control system shown below in Figure 1a must be replaced by a PLC
based system.
X124 V DC
X2ºv
13
13
11
13
S1 E---
K1-1
S4
K2-1
K2-2
1.a.3
14
SYSTEM ON
14
LOW LEVEL
12
PUMP
SYSTEM
14
PUMP
22
N
SENSOR
START PB
11
11
S2 E---
S5
1.a.4
12
HIGH LEVEL
12
SYSTEM
SENSOR
STOP PB
11
S3
1.a.4
12
13
K1-2
SYSTEM ON
14
MAX LEVEL
SENSOR
A1
x1
K1
SYSTEM ON
H1
A2
SYSTEM ON
BLUE
A1
x1
K2
H2
H3
PUMP
A2
PUMP RUN
x2
GREEN
PUMP STOP
RED
Figure 1a: Water Tank Level Control System
a) Using the worksheets 1(a) and 1(b) sketch the PLC inputs and outputs schematic
diagrams respectively.
(5)
b) Write/Sketch a programme using an IEC61131-3 language to implement the previously
hardwired logic.
(10)
c) The water level sensors are replaced by an analogue ultrasonic level transducer.
Explain how this transducer would replace the 'low level' and 'high level' sensors. Include
what changes will be required to the PLC software.
(5)
d) It is proposed to replace the push buttons and lamps with a touch screen HMI. Explain
how this can be achieved; include what changes would be required to the PLC program.
(5)
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