Emerson Process Management 1500 2 I/O problems and remedies continued, 11.9Transmitter status LED

Troubleshooting

Table 11-2I/O problems and remedies continued

Symptom	Possible cause	Possible remedy
mA reading correct at low	mA loop resistance may be too high	Verify that mA output load resistance is below
currents but wrong at higher		maximum supported load (see installation
currents		manual for your transmitter).
Cannot zero with Zero	Not pressing Zero button for sufficient	Button must be pressed for 0.5 seconds to be
button	interval	recognized. Press button until LED starts to
		flash yellow, then release button.
	Core processor in fault mode	Correct core processor faults and retry.
Cannot connect to terminals	Terminals not in service port mode	Terminals are accessible in service port mode
33 & 34 in service port mode		ONLY for a 10-second interval after power-up.
		Cycle power and connect during this interval.
	Leads reversed.	Switch leads and try again.
	Transmitter installed on multidrop	All Model 1500 and 2500 devices on network
	network	default to address=111 during 10-second
		service port interval. Disconnect or power down
		other devices, or use RS-485 communications.
Cannot establish Modbus	Incorrect Modbus configuration	After 10-second interval on power-up, the
communication on terminals		transmitter switches to Modbus
33 & 34		communications. Default settings are:
		• Address=1
		• Baud rate=9600
		• Parity=odd
		Verify configuration. Default settings can be
		changed using ProLink II v2.0 or higher.
	Leads reversed	Switch leads and try again.
DI is fixed and does not	Possible internal/external power	Internal means that the transmitter will supply
respond to input switch	configuration error	power to the output. External means that an
		external pull-up resistor and source are
		required. Verify configuration setting is correct
		for desired application.

11.9Transmitter status LED

The Model 1500 transmitter includes a LED that indicates transmitter status. See Table 11-3. If the status LED indicates an alarm condition:

1.View the alarm code using ProLink II.

2.Identify the alarm (see Section 11.10).

3.Correct the condition.

Table 11-3Model 1500/2500 transmitter status reported by the status LED

Status LED state	Alarm priority	Definition
Green	No alarm	Normal operating mode
Flashing yellow	No alarm	Zero in progress
Yellow	Low severity alarm	• Alarm condition: will not cause measurement error
		• Outputs continue to report process data
		• May indicate that the fill is not completely
		configured
Red	High severity alarm	• Alarm condition: will cause measurement error
		• Outputs go to configured fault indicators, unless
		the output is configured for valve control

94 Micro Motion® Model 1500 Transmitters with the Filling and Dosing Application