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10 Micro Motion
®
Model 1500 Transmitters with the Filling and Dosing Application
Flowmeter Startup
3.3 Performing a loop test
A loop test is a means to:
• Verify that the mA outupt is being sent by the transmitter and received accurately by the
receiving device
• Determine whether or not you need to trim the mA output
• Select and verify the discrete output voltage
• Read the discrete input
Perform a loop test on all inputs and outputs available on your transmitter. Before performing the loop
tests, ensure that your transmitter terminals are configured for the input/outputs that will be used in
your application (see Section 4.3).
ProLink II is used for loop testing. See Figure 3-1 for the loop test procedure. Note the following:
• The mA reading does not need to be exact. You will correct differences when you trim the mA
output. See Section 3.4.
WARNING
Upon transmitter startup or abnormal power reset, any external device
controlled by a discrete output may be momentarily activated.
Upon transmitter startup or abnormal power reset, discrete output states are
unknown. As a result, an external device controlled by a discrete output may
receive current for a brief period.
When using Channel B as a discrete output:
• You can prevent current flow upon normal startup by setting Channel B polarity
to active low (see Section 4.6).
• There is no programmatic method to prevent current flow for Channel B upon
abnormal power reset. You must design the system so that a brief current flow to
the external device controlled by Channel B cannot cause negative
consequences.
When using Channel C as a discrete output, there is no programmatic method to
prevent current flow upon either transmitter startup or abnormal power reset. You
must design the system so that a brief current flow to the external device controlled
by Channel C cannot cause negative consequences.