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DATA-LINC GROUP
8
PN 161-09981-002C
rev 8/04
DDAA1000/SRM User Guide
Analog Operation
Specifications
1. This unit does not provide loop power to devices.
2. The outputs can operate on loops with a maximum total resistance of 300 ohms.
3. The resolution of this unit is 8 bits with accuracy of 2%.
4. All inputs use a common ground connection labeled “G”.
5. This system is not designed to replace PLCs.
6. It is not recommended to use this product with PLC applications.
7. The input signal must be a 4-20 mA signal.
Point-to-Point Analog System
These units are bi-directional, they send and receive analog information both directions. The following is a common example
of analog use for the DDAA1000/SRM units. Again, the Master’s input corresponds to the same numbered output on the
Remote and vice versa. The 8 Master inputs match the 8 Remote outputs and the 8 Remote inputs match the 8 Master
outputs.
Figure 6: Point-to-Point Analog Example
Pwr
4-20mA Input
4-20mA Output
G 1 2 3 4 5 6 7 8G 1 2 3 4 5 6 7 8
mA
13.7
mA
Sensor
with 4 -20 mA
Output
Pwr
4-20mA Input
4-20mA Output
G 1 2 3 4 5 6 7 8G 1 2 3 4 5 6 7 8
Master
Remote
Note: A loop power supply may be
needed. The DDAA1000 unites do not
supply loop power.