II K 4-23
Overview of Software
DCS400 accuracy
Analog values will be converted to digital values via
Anlog Digital Converter (ADC). The accuracy of res-
olution depends on how much bits are used and is
related to 100%. Bipolar values are marked at most
significant bit (sign bit).
Resolution of DCS400 inputs and outputs:
Resolution Steps Input / Output Accuracy
Drive controlled by Serial Communication
15 Bit + sign ±20000 Speed reference/actual val. 0.005%
±4095 all other reference/actual val. 0.025%
Drive controlled by digital/analogue I/O
14 Bit + sign ±16383 Incremental Encoder 0.006%
12 Bit + sign ±4095 Current / Torque 0.025%
11 Bit + sign ±2047 AI1, AI2 0.05%
11 Bit + sign ±2047 AITAC (10V=125%) 0.06%
11 Bit + sign ±2047 AO1, AO2 0.05%
If serial communication is used all reference and
actual values are representet in a 16 bit data word
scaled between +32767 and -32768. For speed refer-
ence/actual values only ±20000 are used, all other
reference/actual values are scaled to ±4095.
If tacho feedback is used the nominal speed value is
scaled to 80% of full resolution. A speed measure-
ment up to 125% of nominal speed is possible. The
accuracy is 0,06% related to nominal speed.
Fig. 4.3/1: Comparison regarding the accuracy between the different control modes
M
DCS 400
COM
M
AO
AI
DCS 400
T
M
AO
AI
DCS 400
Drive controlled by Serial Communication
Speed reference
Fieldbus
Speed actual
value
Speed reference
accuracy
ELWVLJQ
Encoder 14 bit+sign
Speed accuracy = 0.006%
Drive controlled by digital I/O
Speed reference
AI (11 bit+sign)
AO (11 bit+sign)
Speed reference
accuracy
ELWVLJQ
Encoder 14 bit+sign
Speed accuracy = 0.006%
Drive controlled by digital I/O
Speed reference
AI (11 bit+sign)
AO (11 bit+sign)
Speed reference
accuracy
ELWVLJQ
Tacho 11 bit+sign
Speed accuracy = 0.06%
• No additional analogue/digital I/O's necessary
• Most flexibility regarding reference/actual value transmission
Speed actual
value
Speed actual
value
E
E
PLC
PLC
PLC
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