Profibus-DP

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Telegram 4The fourth telegram from the DP master acts as the indication to the DPslave to send the data low byte from the requested parameter. Telegram 4is only evaluated if the ERROR bit is set at 0 (b14 = 0) in telegram 3. The databyte is not used in this telegram, as the menu and parameter number havealready been transmitted.Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Value 1 X X X 0 1 0 0 X X X X X X X XData word: 0x8400 Stamp number = 4If there was no error in telegram 3, this returns the data low byte in the databits.Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Value 1 X X X 0 1 0 0 1 1 0 1 1 1 0 0Data word: 0x84DC Stamp number = 4 Data low byte = DCThe final value of speed feedback = data high byte * 256 + data low byte= 5 * 256 + 220= 1500 rpm6.4 Writing parametersTelegram 1To write to parameters using the non-cyclic channel, the followingtelegrams must be sent on each network cycle to construct the finalmessage.Telegram 1 Define menu number.Telegram 2 Define parameter number.Telegram 3 Set data high byte.Telegram 4 Set data low byte.The first telegram from the DP master indicates a WRITE cycle by setting theR/W bit to 0. The stamp number is set to 1. The data byte contains themenu number for the parameter that is to be written to.Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Value 0 X X X 0 0 0 1 0 0 0 1 0 0 1 0Data word: 0x0112 Stamp number = 1` Menu number = 18When the first telegram has been received and processed in the DP node, itis mirrored in the non-cyclic IN word.24Profibus–DPIssue code: pbnu2
Telegram 2The second telegram from the DP master also indicates a Write cycle, butthe stamp number is now set to 2. The data byte would contain theparameter number for the parameter that is to be written to.Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Value 0 X X X 0 0 1 0 0 0 0 0 1 0 1 1Data word: 0x020B Stamp number = 2 Parameter number = 11When the second telegram has been received and processed in the DP node,it is mirrored in the non-cyclic IN word.Telegram 3The third telegram from the DP master has the stamp number set to 3. Thedata bits contain the data high byte for the parameter being written to.Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0Value 0 X X X 0 0 1 1 0 0 0 0 1 0 1 1Data word: 0x030B Stamp number = 3 Data high byte = 2816When the first telegram has been received and processed in the DP node, itis mirrored in the non-cyclic IN word.Profibus–DPIssue code: pbnu2 25
Page 4: Contents1 Introduction 11.1 Using t
Page 8 and 9: 1.3 Mentor II - MD24The MD24 Profib
Page 11: 3 Electrical installation3.1 Profib
Page 14 and 15: 3.5 Network limitationsThe maximum
Page 16 and 17: 4.5 Network interruptionsIf a Unidr
Page 18 and 19: IN DataProfibus-DPMasterOUT DataNon
Page 20 and 21: 5.5 Mapping conflictsWhen the mappi
Page 22 and 23: 5.8 Saving Mentor II parametersTo i
Page 24 and 25: Example Mentor II control word valu
Page 26 and 27: Status word mappingUnidrive - UD73M
Page 28 and 29: 6.3 Reading parametersTelegram 1Tel
Page 32 and 33: Telegram 4The fourth telegram from
Page 34 and 35: 8 Diagnostics8.1 Determining if net
Page 36 and 37: 9 General information9.1 Option mod
Page 38 and 39: 9.5 System propagation delaysThe wo
Page 40 and 41: Unidrive 3 is the master Drive in t
Page 42 and 43: 10.3 OUT cyclic dataNode Device Cha
Page 44 and 45: 111 Appendix11.1 Profibus-DP networ
Page 46 and 47: 12.3 Control wordsUnidrive - UD73Me
Page 48: 42Profibus-DPIssue code: pbnu2

Profibus-DP

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