FC 78 - Trend Definition

The trend definition function code defines the type of trend desired for each of the 64 inputs to an NAMM02 or IMAMM03 Analog Master Module. The trend definition block stores this information in fixed block 77. Function code 78 provides no useful outputs.

 

Each trend definition has a two-digit input. The first digit (tens) defines trend resolution. The second digit (ones) defines the trending mode.

 

Two resolution choices are available, normal trending and fast trending. Normal trending saves 30 data values at one minute intervals. Fast trending saves those 30 values plus 120 values saved at 15-second intervals. This provides 30 minutes of one-minute samples or 30 minutes of 15-second samples.

 

NOTE: Fast trending requires a higher amount of module utilization than normal trending.

 

Outputs:

Blk

Type

Description

77

R

No usable output

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

99

I

0 - 99

Trend Definition, block 1

S2

N

99

I

0 - 99

Trend Definition, block 2

S3

N

99

I

0 - 99

Trend Definition, block 3

S4

.

.

.

S64

N

.

.

.

N

99

.

.

.

99

I

.

.

.

I

0 - 99

.

.

.

0 - 99

Trend Definition, block 4

.

.

.

Trend Definition, block 64

 

 

78.1  Explanation

 

Each trend definition has a two digit input. The first digit (tens) defines trend resolution. The second digit (ones) defines the trending mode. The initial value of 99 for the specification indicates that trending is not defined for the associated block.

 

NOTE: The console trending package ROM must be installed for this function to be operational. In order for the NAMM02 and IMAMM03 modules to trend properly, the BIM module must have a revision level > D.

 

Normal trending saves 30 data values at one minute intervals. All the points in the module can be configured for normal trending.

 

Fast trending saves 30 values at one minute intervals plus 120 values at 15-second intervals. Due to the additional memory utilization, only selected points can be configured for fast trending.

 

In the sample trending mode, the current point value will be saved every 15 or 60 seconds, depending on trend resolution.

 

In the mean trending mode, the value saved will be the mean value of all values over the trending interval.

 

In the minimum trending mode, the value saved is the minimum value of the point over the trending interval.

 

In the maximum trending mode, the value saved is the maximum value of the point over the trending interval.

 

In the sum trending mode, the value saved is the summation of all values collected over the trending interval.

 

NOTE: The default value of 99 defines trending for a specific point as unused.