Owner's manual

8-3
Input Selector (ISEL) Function Block
Block Errors Table 8-2 lists conditions reported in the BLOCK_ERR parameter.
Conditions in italics are inactive for the ISEL block and are given here
only for your reference.
Modes The ISEL function block supports three modes of operation as defined
by the MODE_BLK parameter:
• Manual (Man) The block output (OUT) may be set manually.
• Automatic (Auto) OUT reflects the selected value.
• Out of Service (O/S) The block is not processed. The
BLOCK_ERR parameter shows Out of Service. In this mode, you
can make changes to all configurable parameters. The target
mode of a block may be restricted to one or more of the
supported modes.
Alarm Detection A block alarm will be generated whenever the BLOCK_ERR has an
error bit set. The types of block error for the ISEL block are
defined above.
Alarms are grouped into five levels of priority:
TABLE 8-2. BLOCK_ERR Conditions
Condition
Number
Condition Name and Description
0 Other: The output has a quality of uncertain.
1 Block Configuration Error
2 Link Configuration Error
3 Simulate Active
4 Local Override: The actual mode is LO.
5 Device Fault State Set
6 Device Needs Maintenance Soon
7 Input Failure/Process Variable has Bad Status: One of the inputs is Bad
or not connected.
8 Output Failure: The output has a quality of Bad.
9 Memory Failure: A memory failure has occurred in FLASH, RAM, or
EEROM memory
10 Lost Static Data
11 Lost NV Data
12 Readback Check Failed
13 Device Needs Maintenance Now
14 Power Up: The device was just powered-up.
15 Out of Service: The actual mode is out of service.
Priority
Number
Priority Description
0 The priority of an alarm condition changes to 0 after the condition that
caused the alarm is corrected.
1 An alarm condition with a priority of 1 is recognized by the system, but is
not reported to the operator.
2 An alarm condition with a priority of 2 is reported to the operator, but does
not require operator attention (such as diagnostics and system alerts).
3-7 Alarm conditions of priority 3 to 7 are advisory alarms of increasing priority.
8-15 Alarm conditions of priority 8 to 15 are critical alarms of increasing priority.