Rockwell Automation 1794-IP4 Series B FLEX I/O PULSE COUNTER User Manual - Manual (Page 57)

6–4 Input, Output and Configuration Files for Analog Modules when used with ControlNet
Publication 1794ĆUM016B-EN-P - August 2002
Bit Description Bit Explanation
0 This bit is set (1) when an error is detected in slot position 0.
1 This bit is set (1) when an error is detected in slot position 1.
2 This bit is set (1) when an error is detected in slot position 2.
I/O Module Fault
3 This bit is set (1) when an error is detected in slot position 3.
I/O Module Fault
4 This bit is set (1) when an error is detected in slot position 4.
5 This bit is set (1) when an error is detected in slot position 5.
6 This bit is set (1) when an error is detected in slot position 6.
7 This bit is set (1) when an error is detected in slot position 7.
Node Address Changed
(Created by PLC-5
controller.)
8
This bit is set (1) when the node address switch setting has been
changed since power up.
I/O State (Created by
PLC-5 controller.)
9
Bit = 0 - idle
Bit = 1 - run
10 thru 15 Not used - set to 0.
Possible causes for an I/O Module Fault are:
•
transmission errors on the FLEX I/O backplane
•
a failed module
•
a module removed from its terminal base
•
incorrect module inserted in a slot position
•
the slot is empty
•
the slot contains a non–discrete module
The ControlNet adapter provides storage for alternate module output
data during communication faults or processor idle state. This “safe
state data” assures that a known output will be applied to the output
devices to maintain a previously designated safe operating condition
during the previously mentioned failure modes. The processor or
scanner software must include the means to specify this safe state
data for each module. If applicable, this data is sent in the
configuration block (see Image Table Mapping later in this chapter).
Device actions include:
•
communication fault behavior
•
idle state behavior
•
input data behavior upon module removal
Safe State Data
Device Actions