188
I/Os and Virtual Connections [500]
Section 11-5
AnIn1 = (10-4) / (20-4) x (1500-0) + 0 = 562.5 rpm
AnIn2 = (5-4) / (20-4) x (300-0) + 0 = 18.75 rpm
The actual process reference will be:
+562.5 + 18.75 = 581 rpm
Analogue Input Selection via Digital Inputs:
When two different external Reference signals are used, e.g. 4-20mA signal
from control centre and a 0-10 V locally mounted potentiometer, it is possible
to switch between these two different analogue input signals via a Digital Input
set to “AnIn Select”.
AnIn1 is 4-20 mA
AnIn2 is 0-10 V
DigIn3 is controlling the AnIn selection; HIGH is 4-20 mA, LOW is 0-10 V
[511] AnIn1 Fc = Process Ref;
set AnIn1 as reference signal input
[512] AnIn1 Setup = 4-20mA;
set AnIn1 for a current reference signal
[513A] AnIn1 Enable = DigIn;
set AnIn1 to be active when DigIn3 is HIGH
[514] AnIn2 Fc = Process Ref;
set AnIn2 as reference signal input
[515] AnIn2 Setup = 0-10V;
set AnIn2 for a voltage reference signal
[516A] AnIn2 Enabl = !DigIn;
set AnIn2 to be active when DigIn3 is LOW
[523] DigIn3=AnIn;
set DIgIn3 as input fot selection of AI reference
Subtracting analogue inputs
Example 2: Subtract two signals
Signal on AnIn1 = 8 V
Signal on AnIn2 = 4 V
[511] AnIn1 Function = Process Ref.
[512] AnIn1 Setup = 0-10 V
[5134] AnIn1 Function Min = Min (0 rpm)
[5136] AnIn1 Function Max = Max (1500 rpm)
[5138] AnIn1 Operation = Add+
[514] AnIn2 Function = Process Ref.
[515] AnIn2 Setup = 0-10 V
[5164] AnIn2 Function Min = Min (0 rpm)
[5166] AnIn2 Function Max = Max (1500 rpm)
[5168] AnIn2 Operation = Sub-
Calculation:
AnIn1 = (8-0) / (10-0) x (1500-0) + 0 = 1200 rpm
AnIn2 = (4-0) / (10-0) x (1500-0) + 0 = 600 rpm
The actual process reference will be:
+1200 - 600 = 600 rpm
The analogue input setup is used to configure the analogue input in accor-
dance with the signal used that will be connected to the analogue input. With
this selection the input can be determined as current (4-20 mA) or voltage
(0-10 V) controlled input. Other selections are available for using a threshold
(live zero), a bipolar input function, or a user defined input range. With a bipo-
Summary of Contents for SX-F
Page 2: ......
Page 14: ...6 Table of contents...
Page 20: ...12 Glossary Section 1 6...
Page 32: ...24 Cabinet mounting Section 2 3...
Page 58: ...50 Connecting options Section 5 6...
Page 72: ...64 Load Monitor and Process Protection 400 Section 7 5...
Page 74: ...66 EMC standards Section 8 1...
Page 266: ...258 System Data 900 Section 11 9...
Page 274: ...266 Maintenance Section 12 3...
Page 284: ...276 Liquid cooling Section 13 12...
