Spectrum Controls 1769sc-IF8u - Manual (Page 64)

54 Compact IO ™ Universal Input module
From Table 4.7, Channel Update Time:
Module Update Time without an Autocalibration Cycle
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time (uses lowest thermocouple filter
selected)
= 56 ms + 56 ms + 56 ms + 56 ms = 224 ms
Module Update Time during an Autocalibration Cycle
Channel 0 Scan 1 (Module Scan 1)
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time + Ch 0 Gain Time
= 56 ms + 56 ms + 56 ms + 56 ms + 101 ms = 325 ms
Channel 0 Scan 3 (Module Scan 2)
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time + Ch 0 Offset Time
= 56 ms + 56 ms + 56 ms + 56 ms + 73 ms = 297 ms
Channel 1 Scan 1 : (no scan impact)
No autocalibration cycle is required because Channel 1 is the same Input
Class as Channel 0. Data is updated in scan 3.
Channel 2, Scan 1 (Module Scan 3)
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time + Ch 2 Gain Time
= 56 ms + 56 ms + 56 ms + 56 ms + 101 ms = 325 ms
Channel 2, Scan 2 (Module Scan 4)
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time + Ch 2 Offset Time
= 56 ms + 56 ms + 56 ms + 56 ms + 73 ms = 297 ms
CJC Scan 1 (Module Scan 5)
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time + CJC Gain Time
= 56 ms + 56 ms + 56 ms + 56 ms + 101 ms = 325 ms
CJC Scan 2 (Module Scan 6)
= Ch 0 Update Time + Ch 1 Update Time
+ Ch 2 Update Time + CJC Update Time + CJC Offset Time
= 56 ms + 56 ms + 56 ms + 56 ms + 73 ms = 297 ms
After the above cycles are complete, the module returns to scans without
autocalibration for approximately 5 minutes. At that time, the
autocalibration cycle repeats.