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FMM-420 MODULE

PROGRAMMING UPDATE

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FMM-420 MODULE

Before we can connect a device to our SLC, it

makes sense to understand the operating

characteristics of a 4-20 device

In most cases, the device will have 3 wires

that connect to the FMM-420 Module.

The wires consist of:

Negative (-)

Sense

Positive (+)

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Select FMM 4-20

FMM-420 MODULE

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After selecting FMM-420 Type Code

CBE-3, 4, 5, 6 and 7 are highlighted.

We will look at specific CBE programming later in this presentation.

FMM-420 MODULE

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FMM-420 MODULE Programming

STEP 1

Specific Device Information

STEP 2Device Thresholds

STEP 3

Device CBEs

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FMM-420 MODULE

4 mA 20 mA

Operating Range is: 4 mA to 20 mA

0 % 100 %

4 mA represents

0 % in this case

20 mA represents

100 % in this case

0100

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Units is the measurement unit of the device:

- Parts Per Million (PPM)

- Parts Per Billion (PPB)

- etc.

FMM-420 MODULE

UNITS is a required field for the device. This value is used as a

programming reference and is not used for FACP computations.

0100

PPM

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If the measurement range is from 0 to 100, you may choose to have a

Hysteresis percentage range of 5.

If so, 9 would be the low end and 14 would be the high end of the

moving percentage range as shown in the graphic below.

4 mA 20 mA

0 9 14 100

5

Hysteresis is a percentage range

along the 4 mA to 20 mA scale

FMM-420 MODULE

0100

PPM

5

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0100PPM

5

When you are satisfied with the Device Parameters

Click the THRESHOLDS button:

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FMM-420 MODULE

A blank Threshold screen appears when clicking the Threshold button

When planning your programming in the threshold screen, it is important

to know what Values will be significant for the device you have installed,

because the Value will correspond directly with a CBE

Before inserting a Value, you must check the CBE box on the left.

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FMM-420 MODULE

For this example, I will check ALL the CBEs

Once a CBE box is checked, Latching is automatically checked. If you

do NOT want the Value to trigger a latching event, uncheck Latching.

Keep in mind that CBE 3, 4, 5, 6 and 7 are automatically assigned to

Thresholds 1 5.

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FMM-420 MODULE

At this point in my programming, I have decided to use all the CBEs

and a fairly even range of 15, 30, 45, 60 and 75

These values are what my device will read in its chamber or sensor

Upon this value being recognized, I must decide what EVENT will

correspond with the value

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FMM-420 MODULE

Note that I have several options for my event types.

Since Fire Codes dont allow us to generate a Fire Alarm by

using a GAS detection device, I will select Non-Fire Trouble

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FMM-420 MODULE

When Non-fire Trouble was selected, Trouble 1 automatically appeared

in the Trouble Type field. However, before we can set the Trouble Type,

we must first set our Trigger field.

The choice Specific Level, simply looks at the SPECIFIC Level of your Value.Upper Limit, is when the Value is reached in an upward direction

and Lower Limit is when the Value is reached in a downward direction.

For this example, I will use Upper Limit

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FMM-420 MODULE

Once the TRIGGER Value has been set, we can select a Trouble Type

Our choices are: Trouble 1, Trouble 2 and Device Inhibit

If we choose Device Inhibit, when the FMM-420 is in a self-calibration

state, a trouble will be generated at the FACP.

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FMM-420 MODULE

REMEMBER

Without AHJ approval

Gas Sensing Devices are NOT to be used to indicate a Fire Condition

Z15

Z45

Z30

Z75

Z60

For this example, I have used the Values for the Zone numbers.

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Questions