X20 system modules • Analog input modules • X20AI4622
X20 system User's Manual 3.10
285
4.3.11.8.9 Input status
Name:
StatusInput01
This register is used to monitor the module inputs. A change in the monitoring status generates an error message.
The following states are monitored depending on the settings:
Value
Voltage signal ±10 V
Current signal 0 to 20 mA
Current signal 4 to 20 mA
0
No error
No error
No error
1
Lower limit value exceeded
Default setting
The input value has a lower limit of 0x0000. Un-
derflow monitoring is therefore not necessary.
After lower limit value change
The input value is limited to the configured val-
ue. The status bit is set when the lower limit val-
ue is passed.
Lower limit value exceeded
2
Upper limit value exceeded
Upper limit value exceeded
Upper limit value exceeded
3
Open line
-
-
Data type
Value
USINT
See bit structure.
Bit structure:
Bit
Description
Value
Information
00
No error
01
Lower limit value exceeded
10
Upper limit value exceeded
0 - 1
Channel 1
11
Open line
...
...
00
No error
01
Lower limit value exceeded
10
Upper limit value exceeded
6 - 7
Channel 4
11
Open line
Limiting the analog value
In addition to the status information, the analog value is set to the values listed below by default when an error
occurs. The analog value is limited to the new values if the limit values were changed.
Error status
Digital value for error (default values)
Open line
+32767 (0x7FFF)
Upper limit value exceeded
+32767 (0x7FFF)
Lower limit value exceeded
-32767 (0x8001)
Invalid value
-32768 (0x8000)
4.3.11.8.10 Minimum cycle time
The minimum cycle time defines how far the bus cycle can be reduced without communication errors occurring.
It should be noted that very fast cycles decrease the idle time available for handling monitoring, diagnostics and
acyclic commands.
Minimum cycle time
Inputs without filtering
100 µs
Inputs with filtering
500 µs
4.3.11.8.11 Minimum I/O update time
The minimum I/O update time defines how far the bus cycle can be reduced while still allowing an I/O update to
take place in each cycle.
Minimum I/O update time
Inputs without filtering
300 µs for all inputs
Inputs with filtering
1 ms