Analog Inputs - ABB DCS 500B Description

Functional Software description

Analog Inputs

Signal Type Selection for In-
puts
Analog Input
AITAC
AI1
6
SP
Function Block name
107
P1
1 CONV MODE
108
HIGH VALUE
P2 20000
109
P3 LOW VALUE
-20000
ST5
Figure 8 Analog Input Function Block
Maximum number of analog inputs is seven. The first five chan-
nels, AITAC, AI1, AI2, AI3 and AI4, are available with the SDCS-
CON-2 or SDCS-IOB-3 boards. The last two channels, AI5 and
AI6, are connected by means of the SDCS-IOE-1 extension I/O
board.
Analog inputs are scaled with parameters:
HIGH VALUE (1XX) = value in OUT+ (XXXXX) that corresponds to
maximum input value (normally +10V or +20 mA).
and
LOW VALUE (1XX) = value in OUT+ (XXXXX) that corresponds to
minimum input value (normally -10V or +20 mA).
If offset balancing is needed, the value of the HIGH and LOW
VALUE has to be increased or decreased slightly.
Note. The temperature measurements are scaled internally in AI2
and AI3 (Ω or °C). The parameters HIGH VALUE and LOW VALUE
have no significance in that case.
The input signal type is defined by parameter CONV MODE (1XX).
The following table shows all possible values for analog input sig-
nals in the DCS500B software.
AIx CONV MODE-parameter selection
1 = -10...+10V
-20...+20mA
2 = 4...20mA, unipolar
3 = Tacho generator voltage
- 10V...+10V
1 = -10...+10V
-20...+20mA
2 = 4...20mA, unipolar
AI2
10707
Output value
OUT+
10708
Negated output value
OUT-
10709
Error code
ERR
Selection of the Input signal type
Value that corresponds to maximum
input (+10V or +20mA)
Value that corresponds to
minimum input (-10V or -20mA)
Terminal boards & settings:
IOB-3: ----
IOB-3: S1:1-2 connected
IOB-3: S1:1-2 connected
CON-2: 3:1-4: 90-270V
CON-2; IOB-3:
CON-2: 500Ω connected X3:5-6
IOB-3: S1:3-4 connected
CON-2: 500Ω connected X3:5-6
IOB-3: S1:3-4 connected
DCS 500 Software Description
X3:2-4: 30-90V
X3:3-4: 0-30V
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