Siemens AS 488/TM manual Pkm, Pkf, Aks, Ake, Bks, Bke, Zks, Zke, Mks, Mel, Sks, Plps

This catalog is out of date, see note on page 3

System architecture

System software

Blocks for processing with standardized operation and monitoring

Type	Name	Function
R	Controller	PID controller, e.g. for disturbance vari-
		able feedforward; tracking of setpoint
		and manipulated variable; limit genera-
		tion
RN	Controller	As R, with additional functions
M	Data monitoring	• Monitors a measured value for 3 pairs of
		limits
		• Extension of controller block for limit
		monitoring
		• Limiting of measured value to error limits
V	Ratio	• Generation of a ratio, e.g. with ratio con-
		trol
		• Proportional adjuster, e.g. with synchro-
		nization control or for influencing the
		command variable of a cascade

BOperator communi- • Display of analog values (e.g. internal

cationresults)

		• Modification of analog and binary val-
		ues (e.g. input of constants)
S	Control circuit	Operation and monitoring of a sequence
		in process engineering systems
G	Subgroup control	Operation and monitoring of sequences
		in power plant systems
GK	Group control	As G, with additional functions
A	Output for binary	Display and modification of a binary
	data	value
F	Window block	Display of 5 measured values; each of
		the 5 values is monitored for a pair of lim-
		its
FN	Window block	• Display and limit monitoring of 5 mea-
		sured values
		• Input of 5 pairs of limits with associated
		hysteresis and of 5 measuring ranges
		for the display
T	Trend	• Display of the trend of two measured
		values as a bargraph; timebase be-
		tween 1.625 s and 36 h
		• Display on commissioning terminal or in
		PROGRAF AS+/NT engineering tool
SR	Recorder	• Summary of max. 4 series of measure-
		ments displayed as dashed curves on
		screen; 4 pairs of limits for monitoring
		the measured values
		• Display on commissioning terminal or in
		PROGRAF AS+/NT engineering tool
C	Switchover	For switching over of binary signals, e.g.
		manual/automatic mode
PKM	Message recording	Records configured messages from
		binary input module/GB block
PKF	Message sequence	• Output of PKM messages; new messag-
	display	es of PKM blocks
		• Display on commissioning terminal or in
		PROGRAF AS+/NT engineering tool

Blocks for signal exchange via the CS 275 or PROFIBUS-TM system bus

Type	Name	Function
AKS	Analog coupling	Transmission of max. 28 analog values
	and transmitter	and abbreviated time (minutes and sec-
	block	onds) from an automation system to
		max. 6 or 32 receivers (AKE blocks)
AKE	Analog coupling	Reception of max. 28 analog values via
	and receiver block	the system bus from the data set of an
		AKS block of another bus station
BKS	Binary coupling and	Transmission of max. 128 binary signals
	transmitter block	and abbreviated time from an automation
		system to max. 6 or 32 receivers (BKE
		blocks)
BKE	Binary coupling and	Reception of max. 128 binary values via
	receiver block	the system bus from the data set of a
		BKS block of another bus station
ZKS	Character coupling	Transmission of max. four S16 strings
	and transmitter	from an automation system to max. 6 or
	block	32 receivers (ZKE blocks)
ZKE	Character coupling	Reception of max. four S16 strings from
	and receiver block	another automation system
MKS	Signal coupling and	Transmission of 32 binary signals as
	transmitter block	messages (with time of signal change
		from "0“ → "1“ or "1“ → "0“) to other bus
		stations
MEL	Signalling	Output of configured plain text messages
		with time (resolution 1 s)
SKS	Status coupling and	Transmission of status information to
	transmitter block	higher-level systems (operation and mon-
		itoring systems, computers)
PLPS	Read and write	Read or write up to 20 parameters with a
	parameters	bus-coupled AS 388/TM or AS 488/TM
		system

2/6 Siemens PLT 112 · 2002