sepam 20 user manual - Schneider Electric

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5 Modbus communication Time-tagging of events Reading of events Exchange word Sepam provides the master or masters with two event tables. The master reads the event table and acknowledges by writing the exchange word. Sepam updates its event table. The events sent by Sepam are not sorted The exchange word is used to manage a special protocol to be sure not to lose events following a communication problem. The event table is numbered for this purpose. The exchange word includes two fields: b most significant byte = exchange number (8 bits): 0..255. chronologically. b15 b14 b13 b12 b11 b10 b09 b08 Structure of the first event table: b exchange word 0040h b event number 1 0041h ... 0048h b event number 2 0049h ... 0050h b event number 3 0051h ... 0058h b event number 4 0059h ... 0060h Structure of the second event table: b exchange word 0070h b event number 1 0071h ... 0078h b event number 2 0079h ... 0080h b event number 3 0081h ... 0088h b event number 4 0089h ... 0090h The master necessarily reads a block of 33 words starting at the address 0040h/0070h, or one word at the address 0040h/0070h. 5/18 Exchange number: 0 .. 255 Description of the MS byte of the exchange word. The exchange number contains a numbering byte which identifies the exchanges. The exchange number is initialized to zero when Sepam is energized. When it reaches its maximum value (FFh), it automatically returns to 0. Sepam numbers the exchanges and the master acknowledges the numbering. b least significant byte = number of events (8 bits): 0..4 b07 b06 b05 b04 b03 b02 b01 b00 Number of events: 0 .. 4 Description of LS byte of the exchange word. Sepam indicates the number of significant events in the event table in the least significant byte of the exchange word. Each non-significant event word is initialized to zero. Event table acknowledgment To inform Sepam that the block read by the master has been correctly received, the master writes the number of the last exchange made in the “Exchange number” field, and resets the "Number of events" field of the exchange word to zero. After acknowledgment, the 4 events in the event table are initialized to zero and the old, acknowledged events are erased in Sepam. Until the exchange word written by the master becomes “X,0” (with X = number of the previous exchange that the master wishes to acknowledge), the exchange word in the table remains at “X, number of previous events”. Sepam only increments the exchange number when new events are present (X+1, number of new events). If the event table is empty, Sepam performs no processing operations when the master reads the event table or the exchange word. The data are encoded in binary form. Clearing an event queue Writing a value "xxFFh" in the exchange word (any exchange number, event number = FFh) reinitializes the corresponding event queue (all stored events not yet transmitted are deleted). Sepam in data loss (1) / no data loss (0) status Sepam has an internal storage queue with a capacity of 64 events. If the queue becomes saturated, a "data loss" event is inserted by Sepam when each event table is read. The detection of events stops and the most recent events are lost. Data loss is managed independently for each of the two event tables. When the tables are read at different rates, data loss may occur at different times for each table or even, in some cases, appear only on the slowest channel. Note: the "data loss" bit of the Sepam check word corresponds to the status of the first reading table (compatibility with earlier versions). PCRED301005EN - 06/<strong>20</strong>08
Modbus communication Time-tagging of events PCRED301005EN - 06/<strong>20</strong>08 Description of event encoding An event is encoded in 8 words with the following structure: Most significant byte Word 1: type of event Least significant byte 08 Word 2: event address Word 3: reserved 00 For remote annunciation, internal data, logic inputs Refer to bit addresses 1000 to 105F 00 00 Word 4: falling edge: disappearance or rising edge: appearance 00 00 Falling edge 00 Word 5: year 01 Rising edge 00 Word 6: month-day 0 to 99 (year) 1 to 12 (month) Word 7: hours-minutes 1 to 31 (day) 0 to 23 (hours) Word 8: milliseconds 0 to 59999 0 to 59 (minutes) 5/19 5
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Electrical network protection Sepam
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PCRED301005EN - 06/2008 Contents In
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Sepam series 20 Contents PCRED30100
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Sepam range Panorama of Sepam appli
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Sepam series 20 Selection table Sub
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Sepam series 20 Environmental chara
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Metering functions Contents PCRED30
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Metering functions Characteristics
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Metering functions Average current
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Metering functions Residual voltage
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MT10252 Network diagnosis functions
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Machine operation assistance functi
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DE80237 Machine operation assistanc
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Switchgear diagnosis functions PCRE
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Protection functions Contents PCRED
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Protection functions Setting ranges
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Protection functions Positive seque
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Protection functions Phase-to-neutr
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Protection functions Temperature mo
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Protection functions Negative seque
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Protection functions Thermal overlo
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Protection functions Phase overcurr
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Protection functions Breaker failur
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DE50247 DE50248 Protection function
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Protection functions Neutral voltag
Page 59 and 60: Protection functions Recloser ANSI
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Page 95 and 96: Modbus communication Modbus protoco
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Page 125 and 126: Modbus communication Reading Sepam
Page 127 and 128: Installation Contents PCRED301005EN
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Page 133 and 134: Installation Base unit Assembly PCR
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Mt11009 DE80122 Installation MSA141
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MT10151 Installation DSM303 Remote
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DE51659 Installation Communication
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PE80322 DE80036 DE80129 Installatio
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Installation ACE969TP-2 and ACE969F
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DB115265 DB115263 DE52165 Installat
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DE80306 DE80022 DE51668 Installatio
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DE80307 DE80022 DE51670 Installatio
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DE80262 Installation ECI850 IEC 618
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Installation ECI850 IEC 61850 Sepam
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Use Contents PCRED301005EN - 06/200
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PE50426 DE80303 DE80343 DE80304 Use
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Use SFT2841 setting and operating s
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Use SFT2841 setting and operating s
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PE80120 Use SFT2841 setting and ope
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PE80118 PE80119 Use SFT2841 setting
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Use Advanced UMI Access to data Acc
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Use Advanced UMI White keys for cur
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Use Advanced UMI Blue keys for para
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Use Default parameter setting The S
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Commissioning Commissioning: princi
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Commissioning General examination a
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Commissioning Checking phase curren
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Commissioning Checking the residual
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Commissioning Checking the residual
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Commissioning Validation of the com
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Commissioning Test sheet Sepam seri
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DE80236 Commissioning Maintenance A
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Schneider Electric Industries SAS 8
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sepam 20 user manual - Schneider Electric

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