Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 309)

Publication 1753-UM001C-EN-P - March 2010 309
System Signal Variables Appendix B
Analog Input Module Variables (AB-AI) for GuardPLC 2000
Controller
The GuardPLC 2000 controller supports these analog input
parameters.
I/O Data Read/Write Description
AI.Mode Write Mode for all channels of the analog input module
0 unipolar (single-ended)
1 differential
AI.State Read Error mask for all analog inputs
0x0000 No errors detected
0x0001 Error of the module
0x0008 Within the safety time: data bus walking bit error
0x0010 Within the safety time: coefficient table check error
0x0020 Within the safety time: supply voltages error
0x0040 Error on A/D conversion (DRDY_HIGH)
0x0080 Within the multiple error occurrence time: error in multiplexer
crosslink
0x0100 Within the multiple error occurrence time: data bus walking
bit error
0x0200 Within the multiple error occurrence time: multiplexer address error
0x0400 Within the multiple error occurrence time: supply voltages error
0x0800 Within the multiple error occurrence time: error in characteristic
curve (Unipolar mode)
0x1000 Within the multiple error occurrence time: limit values/zero point
error (Unipolar mode)
0x2000 Within the multiple error occurrence time: error in characteristic
curve (Differential mode)
0x4000 Within the multiple error occurrence time: limit values/zero point
error (Differential mode)
0x8000 Error in A/D conversion (DRDY_LOW)