FC 81 - Executive

 

The executive function code resides in fixed block zero of a control module. It selects the output mode of the light emitting diodes (LED) on the front panel of the control module. The LEDs display the status of the control module or an internal memory location. The executive function code has 15 output blocks numbered zero through 14. Fixed blocks zero through

nine are fixed values.

 

 

Outputs

 

Blk

Type

Description

0

B

Logic 0

1

B

Logic 1

2

B

0 or 0.000

3

R

-100.000

4

R

-1.000

5

R

0.000

6

R

1.000

7

R

100.000

8

R

-9.2E18

9

R

9.2E18

10

B

Startup in progress flag:

0 = no

1 = yes

11

R

Memory display value

12

R

System free time (%)

13

R

Revision level

14

R

Reserved

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

Y

0

I

0 or 1

Front plate LED display mode:

0 = normal (i.e., module status)

1 = display memory (for diagnostic purposes only)

S2

Y

0

I

0 - 255

Memory display address (most significant byte)

S3

Y

0

I

0 - 255

Memory display address (middle byte)

S4

Y

0

I

0 - 255

Memory display address (least significant byte)

 

 

81.1 Explanation

 

The front panel display of the controller provides diagnostic information that describes the CPU operating condition, additional memory operating information, and additional operating information on the entire module. The product instruction for this controller provides a full description of diagnostic codes.

 

81.1.1 Outputs

 

Output blocks zero through nine are various system constants and are described in the output table. Output blocks ten through 13 provide module status information.

 

 

10 (Startup in progress flag) Logic 1 for the startup period specified by S4 of function code 90 when the module is in execute mode. When startup is successful, this signal reverts to logic 0, and remains at logic 0 as long as the module is in execute mode.

0 = no

1 = yes

 

11 (Memory display value) Either the memory address selected with S2 through S4 or the current module status, depending on which option was selected with S1.

 

12 (System free time in percent) Percentage of free time left in the control module.

Free time = 1 – total module utilization

 

13 (Revision level) Four digit number identifying the module nomenclature, hardware revision level, and firmware revision level as illustrated below.

 

 

 

14  Reserved for future use.