SIEMENS

 

 

 

 

 

 


. Source file for this DB100 is generated in AI_Org.exe and is passed after generation to the user

as text file projectname.awl and it is copied to the clipboard from which can be pasted to the Source File Editor of STEP7.

S7 block DB100 is then created in Source File Editor by selecting Compiling source file.

 

FC 100 & DB100 - can be freely renumbered to any allowed number !

 
 

 

 

 


DB 100 contains all data ( attributes of AI ) which are used by FC100 for AI treatment. For one AI is used 142 bytes.

This structure is repeated in DB as many time as number of consequent AI specified in FC100.

 

Structure of DB 100 :

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Structure for one AI :

 

 

 

 

 

DB100.DBW 0

Value (code) read directly from PIW

INT

AI101_IN

DB100.DBD 2

current 4 - 20 mA

REAL

AI101_mA

DB100.DBD 6

value for LL switch point

REAL

AI101_LLvs

DB100.DBD 10

value for L switch point

REAL

AI101_Lvs

DB100.DBD 14

value for H switch point

REAL

AI101_Hvs

DB100.DBD 18

value for HH switch point

REAL

AI101_HHvs

DB100.DBD 22

value for LL alarm

REAL

AI101_LLva

DB100.DBD 26

value for L alarm

REAL

AI101_Lva

DB100.DBD 30

value for H alarm

REAL

AI101_Hva

DB100.DBD 34

value for HH alarm

REAL

AI101_HHva

DB100.DBD 38

Hysteresis for switch points

REAL

AI101_HYsp

DB100.DBD 42

Hysteresis for alarms

REAL

AI101_HYa

DB100.DBD 46

Filter constant

REAL

AI101_FC

DB100.DBD 50

Low range in physical units

REAL

AI101_LR

DB100.DBD 54

High rang in physical units e

REAL

AI101_HR

DB100.DBD 58

Value in physical units

REAL

AI101_V

DB100.DBX 62.0

Quit alarm

BOOL

AI101_QF

DB100.DBX 62.1

Do filtering

BOOL

AI101_Fi

DB100.DBX 62.2

Cancel all alarms

BOOL

AI101_NA

DB100.DBX 62.3

mask for LL switch point

BOOL

AI101_LLms

DB100.DBX 62.4

mask for L switch point

BOOL

AI101_Lms

DB100.DBX 62.5

mask for H switch point

BOOL

AI101_Hms

DB100.DBX 62.6

mask for HH switch point

BOOL

AI101_HHms

DB100.DBX 62.7

mask for LL alarm

BOOL

AI101_LLma

DB100.DBX 63.0

mask for L alarm

BOOL

AI101_Lma

DB100.DBX 63.1

mask for H alarm

BOOL

AI101_Hma

DB100.DBX 63.2

mask for HH alarm

BOOL

AI101_HHma

DB100.DBX 63.3

AI type 0 = (0)4-20 mA / 1 = PT100

BOOL

AI101_PT

DB100.DBX 63.4

reserve

BOOL

AI101_c14

DB100.DBX 63.5

reserve

BOOL

AI101_c15

DB100.DBX 63.6

reserve

BOOL

AI101_c16

DB100.DBX 63.7

reserve

BOOL

AI101_c17

DB100.DBX 64.0

Error < 4 mA

BOOL

AI101_ErL

DB100.DBX 64.1

Error > 20 mA

BOOL

AI101_ErH

DB100.DBX 64.2

Current loop error - sum

BOOL

AI101_Er

DB100.DBX 64.3

LL switch point

BOOL

AI101_LLsp

DB100.DBX 64.4

L switch point

BOOL

AI101_Lsp

DB100.DBX 64.5

H switch point

BOOL

AI101_Hsp

DB100.DBX 64.6

HH switch point

BOOL

AI101_HHsp

DB100.DBX 64.7

LL alarm

BOOL

AI101_LLa

DB100.DBX 65.0

L alarm

BOOL

AI101_La

DB100.DBX 65.1

H alarm

BOOL

AI101_Ha

DB100.DBX 65.2

HH alarm

BOOL

AI101_HHa

DB100.DBX 65.3

reserve

BOOL

AI101_s13

DB100.DBX 65.4

reserve

BOOL

AI101_s14

DB100.DBX 65.5

reserve

BOOL

AI101_s15

DB100.DBX 65.6

reserve

BOOL

AI101_s16

DB100.DBX 65.7

New alarm

BOOL

AI101_NL

DB100.DBD 66

PID Setpoint

REAL

AI101_C_Sp

DB100.DBD 70

PID Setpoint Min limit

REAL

AI101_C_Si

DB100.DBD 74

PID Setpoint Max limit

REAL

AI101_C_Sx

DB100.DBD 78

PID P - gain

REAL

AI101_C_P

DB100.DBD 82

PID Integral time

TIME

AI101_C_I

DB100.DBD 86

PID CONT_C Derivative time

TIME

AI101_C_D

DB100.DBD 90

PID deadband

REAL

AI101_C_DB

DB100.DBD 94

PID CONT_C Manual setpoint

REAL

AI101_C_Mc

DB100.DBD 98

PID Cycle time

TIME

AI101_C_C

DB100.DBD 102

PID STEP_C minimal pulse

TIME

AI101_C_MP

DB100.DBD 106

PID STEP_C minimal break

TIME

AI101_C_MB

DB100.DBD 110

PID STEP_C travel time

TIME

AI101_C_TT

DB100.DBD 114

PID CONT_C Max limit

REAL

AI101_C_Mx

DB100.DBD 118

PID CONT_C Min limit

REAL

AI101_C_Mi

DB100.DBD 122

PID Disturbance value

REAL

AI101_C_DV

DB100.DBD 126

PID Calculated setpoint

REAL

AI101_C_Cs

DB100.DBD 130

PID CONT_C Controller output 0 100 %

REAL

AI101_C_O

DB100.DBD 134

PID Error value SP - PV

REAL

AI101_C_Er

DB100.DBW 138

PID CONT_C Controller output PQW

WORD

AI101_C_Ow

DB100.DBX 140.0

PID CONT_C High limit reached

BOOL

AI101_C_Hr

DB100.DBX 140.1

PID CONT_C Low limit reached

BOOL

AI101_C_Lr

DB100.DBX 140.2

PID Manual mode

BOOL

AI101_C_MM

DB100.DBX 140.3

Calculated SP is used

BOOL

AI101_C_Cu

DB100.DBX 140.4

PID P is selected

BOOL

AI101_C_Ps

DB100.DBX 140.5

PID I is selected

BOOL

AI101_C_Is

DB100.DBX 140.6

PID CONT_C D is selected

BOOL

AI101_C_Ds

DB100.DBX 140.7

PID I hold

BOOL

AI101_C_Ih

DB100.DBX 141.0

PID I initialization

BOOL

AI101_C_It

DB100.DBX 141.1

PID use calculated SP order

BOOL

AI101_C_IC

DB100.DBX 141.2

PID use own SP order

BOOL

AI101_C_IO

DB100.DBX 141.3

PID Manu mode selection

BOOL

AI101_C_IM

DB100.DBX 141.4

PID AUTO mode selection

BOOL

AI101_C_IA

DB100.DBX 141.5

reserve

BOOL

AI101_C_p15

DB100.DBX 141.6

reserve

BOOL

AI 1

 
AI101_C_p16

DB100.DBX 141.7

reserve

BOOL

AI101_C_p17

DB100.DBW 142

Value (code) read directly from PIW

INT

AI 2

 
AI102_IN

DB100.DBD 144

current 4 - 20 mA

REAL

AI102_mA

DB100.DBD 148

value for LL switch point

REAL

AI102_LLvs

 

 

 

 

 

 

Data from DBB 66 to DBB141 are not used in FC100 but can be used in apropos PID relative to this AI.

Data structure of the "green" area matches to the data structure of standard FB41 CONT_C,FB42 STEP_C from STEP 7 library.

 

 

Explanation of particular attributes of AI.

 

_V is main product of FC100 - it is value represented AI in physical units recalculated from _HR and _LR.

in case of type of PT100 (platinum thermocouple ) the value is calculated PIW x 10 because

PIW in case of PT100 gives "linear" number of tenth of C

Example : PIW = 534 => 53.4 C

_LR is low range of sensor when sensor sends 4 mA, not used when PT100 is connected

 

_HR is high range of sensor when sensor sends 20 mA, not used when PT100 is connected

 

_LLvs limit value; when _V is lower or equal this value _LLsp ( low low switch point ) is reported

_Lvs, _Hvs, _HHvs.

 

_LLva limit value; when _V is lower or equal this value _LLa ( low low alarm ) is reported

_Lva, _Hva, _Hhva.

 

_LLsp, _Lsp, _Hsp, _HHsp switch point bits for using in PLC algorithm

 

_LLa, _La, _Ha, _HHa alarm bits for using in alarm system ( Alarm window )

 

_LLms, _Lms, _Hms, _HHms mask for switch points; if _LLms bit is "1" then _LLsp switch point

can be generated according to _LLvs and _V value

 

_LLma, _Lma, _Hma, _HHma mask for alarms; if _LLma bit is "1" then _LLa alarm

can be generated according to _LLva and _V value

 

_NA all alarms ( NOT switch points! ) are disabled even already existing - global mask for alarms

 

_ErL .. bit is set when current is less than 3,5 mA - broken wire - only for 4 -20 mA

 

_ErH .. bit is set when current is higher than 21 mA - overcurrent - only for 4 -20 mA

 

_Er logical OR of _ErL and _ErH

 

_PT according the type the addressing of PIW is calculateed. Current AI takes 2 bytes, PT100 takes 4 bytes

( one PIW ( two bytes ) is reserved for cicuit which supplyes resistor of PT100 )