© 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 )