FC 215 - Enhanced Analog Slave Definition

The enhanced analog slave definition function code (EASD) defines an IMASI13 universal analog slave module to a Harmony controller. For more information, refer to the IMASI13 Isolated Analog Input Module instruction. This block defines common specifications for IMASI13 modules. Individual input function code 216 blocks are linked to this block to define channels available on the IMASI13 module.

 

The control system must be carefully evaluated to establish

default values that will prevent personal injury and/or property

damage in case of module failure.

 

 

 

 

 

Outputs:

Blk

Type

Description

N

R

Cold junction reference temperature in oC

N+1

B

I/O module status: 0 = good, 1 = bad

N+2

R

Input scan cycle time (secs)

 

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

0

I

0 - 63

I/O module address

S2

N

2

I

Note1

Block address of first enhanced analog input definition (function code 216)

S3

N

5

I

Note1

Block address of cold junction reference input

S4

N

0

I

0 or 1

I/O module failure action:

0 = trip control module

1 = continue operation

S5

N

0

I

0 or 1

Normal mode rejection type:

0 = 60 Hz

1 = 50 Hz

S6

N

0.000

R

Full

Length (in ft) of termination device cable

S7

N

0

I

Full

Spare

S8

N

0

I

Full

Spare

S9

N

0.000

R

Full

Spare

S10

N

0.000

R

Full

Spare

 

 

215.1   Explanation

 

215.1.1  Specifications

 

S1

I/O module expander bus address of the IMASI13 module.

 

S2

Points to the block address of the first enhanced analog input definition (function code 216) function block. Each function code 216 configures one of the channels on the IMASI13 module.  

NOTE: Block addresses and channel numbers can be linked in any order.

 

S3

Contains the block address of the cold junction reference temperature. The value specified by the block address must be in degrees Celsius. This is used for compensation of thermocouple inputs. Specification S3 normally refers to the address of the function code 215 output block N which directs the IMASI13 module to use the local cold junction reference available on the termination device.

 

Figure 215-1 is an example of local cold junction compensation.

 

NOTE: Specification S3 normally refers to EASD blocks. It can reference any function code.

 

Specification S3 can also refer to the address of the block output used for remote cold junction reference. Figure 215-2 is an example of remote cold junction compensation.

 

S4

Identifies the action to be taken in the event of a failure of the IMASI13 module.

0 = trip control module

1 = continue operation

 

S5

Identifies the dominant noise frequency rejected during the analog to digital conversion operation.

0 = 60 hertz

1 = 50 hertz

 

S6

Length of the cable (in feet) between the termination device and the I/O module. The I/O module uses this to compensate

the measured input value for the effects of resistance in the cable.

 

 

 

215.1.2   Outputs

 

N

Temperature in degrees Celsius of the cold junction reference for thermocouple inputs as measured by the built in RTDs on the termination device of the IMASI13 module.

 

N+1

Indicates if a failure of the IMASI13 module is detected.

0 = good

1 = failed I/O module

 

N+2

Represents the amount of time between successive updates of an individual channel input value and quality. This is the total scan time of all points defined for the I/O module.

 

 

 

215.2   Applications

 

Figure 215-1 is a typical example of local cold junction compensation. Tables 215-1, 215-2, 215-3 and 215-4 explain the specification settings for the blocks used in Figure 215-1.  Remote cold junction reference inputs automatically use the on-board cold junction reference for thermocouple compensation. Figure 215-2 shows a typical example of remote cold junction compensation. Tables 215-5, 215-6 and 215-7 list the specification values and descriptions for Figure 215-2.