BLOCK_ERR conditions (continued)Table 7-21:
Condition num-
ber Condition name and description
5 Device fault state set
6 Device needs maintenance soon
7 Input failure/process variable has bad status: The hardware is bad, or a bad sta-
tus is being simulated.
8 Output failure: The output is bad based primarily upon a bad input.
9 Memory failure
10 Lost static data
11 Lost NV data
12 Readback check failed
13 Device needs maintenance soon
14 Power up
15 Out of service: The actual mode is out of service.
7.8.9 Modes
The AI 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 analog input measurement or the simulated value
when simulation is enabled.
• Out of service (O/S): The block is not processed. FIELD_VAL and PV are not updated, and
the OUT status is set to Bad: Out of Service. 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.
7.8.10
Alarm detection
A block alarm is generated whenever the BLOCK_ERR has an error bit set. The types of
block errors for the AI block are defined above.
Process alarm detection is based on the OUT value. You can configure the alarm limits of
the following standard alarms:
• High (HI_LIM)
• High high (HI_HI_LIM)
• Low (LO_LIM)
• Low low (LO_LO_LIM)
Foundation Fieldbus
140 OCX 8800
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