teleperm m
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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