User Manual

Compact IO™ Isolated HART Analog Input Module
U ser 's M a n u a l 0 300 21 5- 03 R ev. A
9-2
These devices must be wired in series so that when any one device opens, the master
control relay is de-energized, thereby removing power to the machine. Never alter these
circuits to defeat their function. Serious injury or machine damage could result.
Sec t ion 9.2
Module Operation
vs. Channel
Operation
The module performs diagnostic op erations at both the module level and the channel
level. Module-level operations include functions such as power-up, configuration, and
communication with a 1769 bus master, such as a MicroLogix 1500 controller, 1769-
ADN DeviceNet Adapter, or CompactLogix controller.
Channel-level operations describe channel related functions, such as data conversion and
over- or under-range detection.
Internal diagnostics are performed at both levels of operation. When detected, module
error conditions are immediately indicated by the module st atus LED. Both module
hardware and channel configuration error conditions are reported to the controller .
Channel over-range or under-range conditions are visible in the module’s input data
table. Module hardware errors are typically reported in the controller’s I/O status file.
Refer to your controller manual for details.
Sec t ion 9.3
Power-up
Diagnostics
At module power-up, a series of internal diagnostic tests are performed. If these
diagnostic tests ar e not successfully completed, the module status LED re mains off and a
module error is reported to the controller.
Table 9-1 (LED Status)
If module status LE D
is:
Indicated
condition
C orrect iv e act ion :
On Prop er O perat ion
No actio n requ ire d
Of f Modu le Fa ult
C yc le po we r . If
condi ti on per si sts,
repl ace the m odule.
Call your local
di str ibu tor or
Spectr um Controls
f or assist ance.
Sec t ion 9.4
Channel
Diagnostics
When an input channel is enab led, the module performs a diagnostic check to see that the
channel has been properly configured. In add ition, the channel is tested on every scan for
configuration errors, over-range and under-range, and open-circ uit conditions.
9.4.1 Invalid Channel Configuration Detection
Whenever a channel configuration word is improperly defined, the module reports an
error. See Table 9-4 for a description of module errors.