Sel SEL-2600 - Page 9

Date Code 20000525 SEL-2600 RTD Module
SEL-2030 Communications Processor Applications
9
Line 3: Subtracts the measured RTD temperature from the threshold and
stores the result in register 034h. If the result is negative, the mea-
sured RTD temperature is above the threshold and Bit 15 (the sign
bit) of 034h is set.
Line 4: Copies the sign bit (Bit 15) of 034h into Bit 0 of 035h.
Line 5: Clears Bit 0 of 35h if RTD is shorted.
Line 6: Clears Bit 0 of 35h if RTD is open.
Table 2 SEL-2030 Communications Processor Memory Map
This logic can be expanded to operate on additional RTDs. Use the SET A
command to reserve additional registers for mathematical equations.
SET A USER 4
USER = 57
Table 2 SEL-2030 Communications Processor Memory Map
Address (hex) Offset Data Description
F800h–F801h 0–01h Milliseconds since device power-up
F802h 02h Device status
F803h 03h RTD 1, 100-ohm platinum
F804h 04h RTD 1, 100-ohm nickel
F805h 05h RTD 1, 120-ohm nickel
F806h 06h RTD 1, 10-ohm copper
F807h 07h RTD 2, 100-ohm platinum
F808h 08h RTD 2, 100-ohm nickel
F809h 09h RTD 2, 120-ohm nickel
F80Ah 0Ah RTD 2, 10-ohm copper
•
•
(this 4-register sequence is repeated for RTD 3 through RTD11)
•
•
F82Fh 2Fh RTD 12, 100-ohm platinum
F830h 30h RTD 12, 100-ohm nickel
F831h 31h RTD 12, 120-ohm nickel
F832h 32h RTD 12, 10-ohm copper
F833h–F835h 33h–35h Storage for mathematical functions