Rockwell Automation T7420A_AF ICS Regent+Plus Analog Input Modules 60Hz Rejection and Fast Response User Manual
Page 29
Analog Input Modules (T7420A, AF)
P D - 7 0 2 3 M a r - 0 6
29
Miscellaneous Input Circuit Specifications
Function
Signal
Mode
Value
I leakage
AI1 through AI16
—
50 nanoA (max.)
Rin (re AGND)
AI1 through AI16
—
100 Mohm (min.)
Rin (re AREF2)
AREF1
—
100 Mohm (min.)
Rin (note 1)
AI1 through AI16
SE
100 Mohm (min.)
CMR (note 2)
AI1 through AI16
SE
51 dB min.
CMR (note 3)
AI1 - AI16
SE
41 dB min.
CMR (note 4)
AI1 through AI16
SE
66 dB min.
NMR (note 5)
AI1 through AI16
SE
(note 5)
Rin (re AGND)
AI1/2 - AI15/16
DIFF
100 Mohm (min.)
CMR (note 6)
AI1/2 - AI15/16
DIFF
72 dB min.
CMR (note 7)
AI1/2 - AI15/16
DIFF
49 dB min.
CMR (note 8)
AI1/2 - AI15/16
DIFF
81 dB min.
NMR (note 9)
AI1/2 - AI15/16
DIFF
(note 9)
Notes:
1)
AI1 through AI8 are referenced to AREF1. AI9 through AI16 are
referenced to AREF2.
2)
CMR: DC to 20 kHz, AI1-AREF1 through AI8-AREF1, AI9-AREF2
through AI16-AREF2. Referenced to AGND (model T7420A).
3)
CMR: Same as note 2 except model T7420AF.
4)
CMR: 60Hz, AI1-AREF1 through AI8-AREF1, AI9-AREF2 through AI16-
AREF2. Referenced to AGND.
5)
Normal mode rejection (single ended).
6)
CMR: DC to 20 kHz, Differential signal referenced to AGND.
7)
CMR: Same as note 6 except model T7420AF.
8)
CMR: 50 Hz, Differential signal referenced to AGND.
9)
Normal mode rejection (differential).