teleperm m

TELEPERM M
Automation Systems AS 235 / AS 235 K / AS 235 H /
AS 230 (E version) / AS 230 K (E version)
Product Information on Memory Module 6DS1 844-8FA
Product Information
Order No. C79000-M8076-C500-02
Contents
Page
1
2
3
4
4.1
4.2
5
2
2
2
4
4
5
6
Application
Design
Mode of Operation
Commissioning
Jumper Settings
Backup Battery
Technical Data
© Siemens AG 1997
Product information
1
Application
Use in systems
Use of the memory module 6DS1 844-8FA provides the AS 235, AS 235 K
and AS 235 H systems as well as the AS 230 and AS 230 K systems (E
versions of the latter two) with extended properties (see Section 1 of
"Handling Instructions", C79000-B8076-C500).
Memory areas
The automation systems with this memory module have
• a user memory of max. 4000 Kbyte and
• a system memory of 1024 Kbyte.
2
Design
The design of the memory module 6DS1844-8FA corresponds to that of the
memory module 6DS1837-8xA or 6DS1 844-8CA/-8DA and is used in the
same location as these.
3
Mode of Operation
Central processing unit The CPU 235 divides the memory and access operations into
• the system RAM of 1024 Kbyte (with 6DS1844-8FA) with read-only and
battery-backed RAM for all system programs and fixed system data,
• the user RAM of 4000 Kbyte (with 6DS1844-8FA), also battery-backed,
for variable system data and all application programs and data,
• the I/O access range.
Restart/cold restart/
warm restart
The memory module 6DS1844-8FA has a switch with three positions:
BOOT, RUN and DEL.
The mode of operation corresponds to the switches of the memory modules
6DS1837-8DA/-8EA/-8FA or 6DS1 844-8CA / -8DA (see Instructions in the
corresponding Manuals).
Microprogram startup The microprogram – together with the system program – carries out a
memory test when started.
Functions
The memory module has the following functions:
•
•
•
•
•
•
•
•
•
1024 Kbyte system memory
4000 Kbyte user RAM
Backup battery
Battery failure logic
1-bit error correction, byte by byte (EDC = error detection and correction)
Multibit error monitoring, byte by byte
Error and control registers
Error and status displays on front panel LEDs
Boot logic
The memory module 6DS1 844-8FA has the same breakdown in the system and user RAMs as
the previous modules 6DS 1 844-8CA and 6DS 1 844-8DA:
- System RAM (SYST-RAM) 1 Mbyte
- User RAM (ANW-RAM)
4 Mbyte
4000 Kbyte of these are available to the user
2
© Siemens AG 1997 C79000-M8076-C500-02
Product information
Cycle time/access time The following table provides a summary of the system timings:
Cycle time:
Access time:
In AS 230 / K
In AS 235 / K
In AS 235 H
500 ns
300 ns
400 ns
200 ns
500 ns
300 ns
Operating mode
The operating mode (use in AS 230 or AS 235) must be set on the module
using the plug-in jumper X6 (see Section 4.1).
EDC
Compared to the previous modules, the new storage module 6DS1 844-8FA
has 1-bit error correction per byte which is implemented using EDC ICs
(error detection and correction).
When writing, the EDC IC generates 5 check bits per data byte which are
stored in a separate area like the data. When reading, 1-bit errors are
corrected by means of the check bits, and multibit errors are signalled.
When writing in the memory, the value corrected by the EDC IC is stored in
the RAM. This is carried out by a test program present in the system
software version ≥ G01.05 and newer which cyclically reads and writes the
system and user RAMs. The 1-bit errors known as soft errors thus no longer
appear.
If a multibit error is detected when reading a word from the memory, this
error is signalled by the PAF signal (parity error) and appropriately
processed further by the system programs. This signal was used by the
previous modules 6DS1 837-8xA and 6DS1 844-8CA / -8DA to signal a
parity error.
The significance of the I & C signals with respect to system-internal memory
tests thus basically remains the same. Interpretation of these I & C signals
as a soft error is no longer possible since, as already mentioned, it no longer
occurs.
SYST.WART
The test program can be monitored and operated in SYST.WART in the test
and maintenance function "RAM CHECK" ("KONTROLLE RAM").
The following functions are available:
Status codes:
• Addresses (dec) which are processed by the test program
• Addresses (dec) in which a multibit error has occurred
• Value (hex) read out of the faulty RAM location.
Operations:
• Set pointer of cyclic test program to address in system RAM or user RAM
• Reset status codes.
© Siemens AG 1997 C79000-M8076-C500-01
3
Product information
RAM CHECK
Address (DEC)
VALUE (HEX)
<Address at which the
error was detected>
<Faulty value>
NO STATUS CODES
Message if no faults/values have been detected
Empty line if faults/values have been detected
ANW or SYS <Address>
<Number of cycles> MAL
CURRENT PROCESSING:
END REACHED:
Operations :
L1=1;
RS=1;
Delete list (ADDRESSES, VALUES)
Delete list (ADDRESSES, VALUES) as well as number of cycles, and set test program
pointer to initial address of system RAM.
TE
SY=<Address dec>;
AN=<Address dec>;
4
Extended process operation keyboard inscription
Set test program pointer to system RAM address
Set test program pointer to user RAM address
Commissioning
Systems with the memory module 6DS1 844-8FA have the same response when commissioning as
systems with the memory modules 6DS1 837-8DA/-EA/-FA or 6DS1 844-8CA/-DA. Observe the
corresponding notes and handling information in the Instructions included in the Manuals.
4.1 Jumper Settings
Jumper settings on memory module 6DS1 844-8FA
1
X13
Battery compartment +
X6
D 67
D 60
Switch
D32
BOOT
RUN
DEL
rd gn
⊗ ⊗
FAULT
4
D31
D23
D 22
S1
1
X3
BOOT
Jumper X6:
Inserted for operation in AS 235, AS 235 K and AS 235 H
Open for operation in AS 230
Jumper X3:
Remains open (only for test purposes)
© Siemens AG 1997 C79000-M8076-C500-02
Product information
4.2 Backup Battery
Battery type
A lithium battery (type AA) is used for backup. The battery is located in a
horizontal compartment on the memory module 6DS1844-8FA.
Monitoring
The battery voltage is monitored cyclically every 60 s. If the voltage drops
below 2.8 V, this is signalled on the fault LED (signalling logic and cabinet
lamp) and by a system message (S357).
Battery failure
A temporary failure (e.g. when replacing the battery during floating
operation) is detected by the module. During the next system startup, the
module automatically reacts with a BOOT request.
Capacity
The capacity of the lithium battery is sufficient for a backup time of at least
480 hours.
!
Caution
If the memory module is removed in buffer mode, no guarantee can be provided
for the saved data.
Fitting/removal
Carefully pull out the battery compartment as far as possible using the
handle. Remove old battery, insert new battery with correct polarity, insert
battery compartment completely until it latches in again. The compartment
can also be removed completely by pressing in the latches on the side.
+
Ensure correct polarity of battery when inserting!
NEGATIVE POLE on handle!
© Siemens AG 1997 C79000-M8076-C500-01
5
Product information
Notes on data backup
These notes refer to memory module 6DS1 844-8FA in conjunction with software version G.
The voltage level of the lithium battery provided on the memory module for backing up the data is
monitored. The logic detects when the permissible output voltage is fallen below when backing up,
and stores this status for restarting.
(= battery failure BAU, BOOT request).
Like all batteries, lithium batteries indicate a higher output voltage at no-load than when under load as
a result of their internal resistance and depending on the extent of discharge.
Since the backup battery is not loaded during regular operation of the AS (no-load), the monitoring
logic can only conditionally detect and signal (S 357) the state "Battery flat" at this time for the abovementioned reasons.
By means of the buffered real-time clock on the memory module, the system with software version G
signals the failure time every time it is switched on.
Refer to function description (C79000-G8076-C416), including FSA.ORPA.FSA(19-22) and
GB.ORPA.144.
If it is to be expected when operating the AS that the max. backup time (480 h) listed in the Manual
could be reached or exceeded within a maintenance interval (battery replacement), it is
recommendable to add up the failure times by means of user configuring/TML programming and to
generate a user message from this to guarantee sufficiently early replacement of the backup battery
(maintenance).
5
Technical Data
Technical data
Notes
Memory
Static CMOS-RAM
Interface to CPU
16-bit data bus
Addressable units
Byte (8 bits), word (16 bits)
Data protection
5 check bits, byte by byte
System software > G01.05
1-bit error correction per byte
Signalling of multibit errors
System memory
< 1024 Kbyte, read-only
Main memory
< 4000 Kbyte
Data saving
With lithium backup battery (type AA)
Memory backup time
At least 480 hours
Battery replacement
At least once a year
Protection, hardware
Monitoring for acknowledgment delay
Monitoring of backup battery
6
© Siemens AG 1997 C79000-M8076-C500-02