Allen-Bradley 1756

Rockwell Automation Publication 1756-RM011A-EN-P - June 2016 13
Emulation Mode Chapter 2
Emulation Mode Differences
The following is a list of differences resulting from using an 8-channel module
to emulate a 6-channel module.
Input Ranges
The input ranges are slightly different on the 8-channel modules resulting in
differing overrange/underrange trip channels that usually denote wire off.
Output Ranges
The output ranges are slightly different on the 8-channel modules resulting in
differing output limits.
Table 2 - Input Range Emulation Differences
Module Input Range 6-Channel
Underrange
6-Channel
Overrange
Emulation
Underrange
Emulation
Overrange
1756-IF6I +/- 10V -10.54688 10.54688 -10.50
(1)
(1) Emulation in these values is limited compared to the 6-channel modules.
10.50
(1)
0…10V 0.00 10.54688 0.00 10.50
(1)
0…5V 0.00 5.27344 0.00 5.25
(1)
0…20mA 0.00 21.09376 0.00 21.00
(1)
1756-IF6CIS 0…20mA 0.00 21.44622 0.00 21.00
(1)
1756-IR6I 1…487 Ohms 0.859068 507.86211 0.00 510.00
2…1000 Ohms 2.00 1016.50237 0.00 1020.00
4…2000 Ohms 4.00 2033.77999 0.00 2040.00
8…4000 Ohms 8.00 4068.39211 0.00 4080.00
1756-IT6I -12…30mV -15.80323 31.39626 -101.00 101.00
1756-IT6I2 -12…78mV -15.15836 79.24062 -101.00 101.00
Table 3 - Output Range Emulation Differences
Module Output Range 6-Channel
Underrange
6-Channel
Overrange
Emulation
Underrange
Emulation
Overrange
1756-OF6CI 0…20mA 0.00 21.07435 0.00 21.00
(1)
1756-OF6VI +/- 10V -10.5172 10.5172 -10.50
(1)
(1) Emulation in these values is limited compared to the 6-channel modules.
10.50
(1)