Siemens AS 235 appendix Data blocks

This catalog is out of date, see note on page 1

System architecture

Configuring

Standard function blocks

Blocks for processing with

￿
standardized operation and monitoring
Type	Designation	Function
R	Closed-loop control-	PID control, e.g. for disturbance
	ler	variable	feedforward, tracking of
		setpoint and manipulated vari-
		able, limit	formation
RN		As R,
		with	additional functions
M	Measured-value	Monitors a measured value for 3
	monitoring	pairs of	limits
		Extension	of a closed-loop con-
		trol block for limit monitoring
		Limitation	of measured value at
		the error limits
V	Ratio	Generation of a ratio, e.g. with a
		ratio control
		Proportional adjuster, e.g. with
		synchronization control or to influ-
		ence the command variable in a
		cascade
B
	Operation block	Display of analog values (internal
		result of calculations, ...)
		Access to analog and binary val-
		ues (input of constants, ...)
S	Control unit	Operation and monitoring of a
		sequence in process plants
G	Subgroup control	Operation and monitoring of
		sequences in power plants
GK	Group control	As G,
		with additional functions
A	Output for binary	Display of and access to a binary
	data	value
F	Window block	Display of 5 measured values;
		each of the 5 values is monitored
		for a pair of limits
FN	Window block	Display and limit monitoring of 5
		measured values;
		input of 5 pairs of limits each with
		hysteresis as well as 5 ranges for
		the measured value display
T	Trend 1)	Display of the trend of 2 mea-
		sured values as a bargraph; time
		base between 1.625 s and 36 h
SR	Recorder 1)	Summary of up to 4 series of
		measurements, displayed on
		screen as dashed-line curves;
		4 pairs of limits for monitoring the
		measured values
C	Selector	To switch over binary signals,
		e.g. manual/automatic mode
PKM	Alarm acquisition	Acquires planned alarms from
		binary input module/GB block
PKF	Alarm sequence dis-	Output of PKM alarms; new
	play 1)	alarms of PKM blocks, display of

alarm history

1) Displays in PROGRAF AS+

Data blocks

	Type	Designation	Function
	GA	Data block for global	Storage of 256 analog values
		analog values	with error 10-9;
			storage of process image, histor-
			ical values etc.
	GB	Data block for global	Storage and scanning of 256
		binary values	binary values;
			especially for binary process
			inputs and outputs
	GM	Data block for global	Storage and scanning of 256
		flags	internal binary statuses
	GT	Data block for global	Storage and generation of times/
￿FA		times (timer)	timers for execution of time-
			dependent functions
		Data field block for	Storage of internal/external ana-
		analog values	log values with error 10-9;
			especially for internal results
	FSA	Data field block for	Storage of internal/external ana-
		analog values	log values with error 10-4; espe-
			cially for internal results
	FB	Data field block for	Storage of internal/external
		binary data	binary values; extension of GB/
			GM blocks
	FC	Data field block for	Storage of characters (texts)
		characters
	Blocks for signal exchange via CS 275
	Type
		Designation	Function
	AKS	Analog coupling and	Transmission of up to 28 analog
		transmitter block	values and abbreviated time
			(minutes and seconds) from an
			AS 235 system to a max. of 6 or
			32 receivers (AKE blocks)
	AKE	Analog coupling and	Reception of up to 28 analog val-
		receiver block	ues via the CS 275 from the data
			set of an MKS block of another
			bus participant
	BKS	Binary coupling and	Transmission of up to 128 binary
￿BKE		transmitter block	signals and abbreviated time
			from an AS 235 to a max. of 6 or
			32 receivers (BKE blocks)
		Binary coupling and	Reception of up to 128 binary val-
		receiver block	ues via the CS 275 from the data
			set of a BKS block of another bus
			participant
	ZKS	Character coupling	Transmission of up to four S16
		and transmitter block	strings from an AS 235 to up to 6
			or 32 receivers (ZKE blocks)
	ZKE	Character coupling	Reception of up to four S16
		and receiver block	strings from another AS system
	MKS	Alarm coupling and	Transition of 32 binary signals as
		transmitter block	alarms (with the time a signal
			changes from 0→1 or 1→0) to
			other bus participants
	MKE	Alarm coupling and	Reception of 32 binary signals of
		receiver block	an MKS block and the time of
			transmission sent by another bus
			participant via the CS 275
	SKS	Status coupling and	Transfer of status information to
		transmitter block	higher-level systems (operator
			system, computer)
	PLPS	Reading and writing	Reading or writing of up to 20
		of parameters	parameters from a bus-coupled
			AS 235 system

2/6 Siemens PLT 111 · 1999