Teledyne M200E and M400E Status LEDs & Watch Dog Circuitry, Watchdog Indicator D1, D1 RED, Rev B3

Models: M200E and M400E M100E

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2.3. Status LEDs & Watch Dog Circuitry

Addendum to E-Series Operator Manuals

Relay PCA 04523

2.3. Status LEDs & Watch Dog Circuitry

Like the previous version, the status LED’s on the Relay PCA 04523 includes thirteen LEDs that indicate the status of the analyzer’s heaters, valves and other general operating conditions. Since the functions represented by these LED differs from model to model, check your M100E/M200E/M400E operator’s manual for their exact assignments (this can normally be found in the section on Electronic Theory of Operation).

While the functional assignments for the LED’s of each model have remained unchanged their location on the PCA is different. See Figure 2-3 of this addendum for the new locations.

2.3.1. Watchdog Indicator (D1)

The most important of the status LED’s on the relay board is the red I1C Bus watch-dog LED. It is controlled directly analyzer’s CPU over the I2C bus. Special circuitry on the relay PCA watches the status of D1. Should this LED ever stay ON or OFF for 30 seconds, indicating that the CPU or I2C bus has stopped functioning, this Watchdog Circuit automatically shuts all valves and turn off all heaters and lamps.

 

D7 (Green)

D4 (Yellow)

D8 (Green)

D3 (Yellow)

D9 (Green)

D2 (Yellow)

D10 (Green)

D5(Yellow)2.3.1. Watchdog Indicator (D1)

D6 (Yellow)

D11 (Green)

D12 (Green)

D13 (Green)

D14 (Green)

D15 (Green)

D16 (Green)

D1 (RED)

Watchdog

Indicator

Figure 2-6: Status LED Locations – Relay PCA 04523

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05118 Rev B3

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Teledyne M200E and M400E, M100E manual Status LEDs & Watch Dog Circuitry, Watchdog Indicator D1, D1 RED, Relay PCA, Rev B3