Sensor systems 2 AS-Interface

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Masters and Gateways Power Supplies, Extender, Repeaters Safety at work I/O Modules Control cabinet I/O Modules Field application Analogue modules Other modules Inductive sensors Photoelectric sensors Rotary encoders Accessories Singleturn absolute encoder Addresses Slave A Slave B Slave C Slave D Preset address 1 2 3 4 IO code 7 0 0 0 ID code F F F F 288 BVE14 When readdressing by means of a bus master or a programming device, it is absolutely essential to assign different addresses to the four integrated AS-Interface chips. Parameter bits The four parameter bits of slave A are used to set the parameters of the rotary encoder. The parameter bits of slave B, C and D are not used. Status of Slave A parameter bit P0 P1 P2 P3 0 Gray code Transfer with flag bits Descending counting direction for clockwise rotation Not used 1 Binary code Transfer without flag bits Ascending counting direction for clockwise rotation Not used Data bits From the AS-Interface master to the rotary encoder Data from the AS-Interface master are transferred to the rotary encoder via slave A, which works bidirectionally. Slaves B, C and D work unidirectionally, i.e. they are incapable of receiving data. Status of Slave A D0/D1 or D2/D3 D0/D1 D2/D3 00 Normal mode Position data are not saved! 01 Rotary encoder is set to ¼ of the singleturn resolution. Position data are saved! 10 Rotary encoder is set to 0. Position data are saved! 11 Normal mode Position data are not saved! When a change is made in data bits D2 and D3 from 01 to 10 or vice-versa, position data are resaved in the rotary encoder. From the rotary encoder to the AS-Interface master Depending on the value of parameter bit P1 of slave A, data transfer to the AS-Interface master takes place with or without flag bits. P1 = 1: Transfer without flag bits Slave A Slave B Slave C Slave D D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 Bit 0 Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 Bit 9 Bit 10 Bit 11 Bit 12 Not used! P1 = 0: Transfer with flag bits MA, MB, MC, MD Slave A Slave B Slave C Slave D D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 D0 D1 D2 D3 Bit 0 Bit 1 Bit 2 MA Bit 3 Bit 4 Bit 5 MB Bit 6 Bit 7 Bit 8 MC Bit 9 Bit 10 Bit 11 MD Operating modes Address assignments for the four slaves The AS-Interface master accesses all slaves one after the other within an AS-Interface cycle in order to transfer output data to slave A or to read in input data from the slaves. The singleturn absolute encoder uses only four AS-Interface chips to transfer the position data that are 13 bits wide, i. e. four slave addresses are assigned. Since these four slaves are queried one after the other, the data may originate from any one of four different sampling times. To minimise the influence of this effect, sequential addresses (n, n+1, n+2 and n+3) should be assigned to slaves A, B, C and D. Furthermore, it should be noted that slave A is responsible for controlling the functions of the absolute encoder. If the order of the slaves is changed (D = n, C = n+1, B = n+2, A = n+3), the output word, which is supposed to be transmitted by the function control module of the absolute encoder, will not be transmitted until slaves D, C and B have been read in. Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group Tel.: Germany +49 621 776-0 USA +1 330 4253555 Singapore +65 67799091 Internet http://www.pepperl-fuchs.com Issue date 2004-11-19 - Catalogue AS-Interface 2004/2005
Issue date 2004-11-19 - Catalogue AS-Interface 2004/2005 Singleturn absolute encoder BVE14 A memory command would thus only take effect for slave A. The command would not take effect for slaves that were already read until the next read cycle. Data consistency would be lost because of the change of order. Temporary storage and transfer with flag bits If individual telegrams of the four slaves to the AS-Interface master suffer interference, it may happen in spite of temporary storage in the rotary encoder that the data that are transferred to the control module do not all originate from the same position data set. Transferring one flag bit for each slave makes it possible for the control module to check which position data set an individual data set belongs to by comparing the four flag bits. Data bit D2 is used for this purpose. Example: Slave A Position data Cycle Data bit D2 Slave A Slave B Slave C Slave D 1 0 XXX0 XXX0 XXX0 XXX0 2 1 XXX1 XXX1 XXX1 XXX1 3 0 XXX0 XXX0 XXX0 XXX0 4 etc. 1 XXX1 XXX1 XXX1 XXX1 Bit D2 is influenced by the control module. Bit 4 of the input data corresponds to the value of this bit for each slave. D2 is set to 0 in cycle 1. If the value of bit 4 of a slave were "1", that value would be derived from another cycle. This is a simple way to recognise data consistency. Transferring the flag bits, however, reduces the usable position data from 13 bits to 12. Masking out the fourth bit of each slave increases slightly the effort of putting together the position data set in the control module. Order code B V E 1 4 – 1 2 3 B – 8 1 9 2 Principle of operation E Singleturn Shaft version V Solid shaft Data format B AS-Interface Steps per revolution Connection type 3 Cable Ø11.2 mm, 8-core and protective conductor, 2 m Subject to reasonable modifications due to technical advances. Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group Tel.: Germany +49 621 776-0 USA +1 330 4253555 Singapore +65 67799091 Internet http://www.pepperl-fuchs.com 289 Masters and Gateways Power Supplies, Extender, Repeaters Safety at work I/O Modules Control cabinet I/O Modules Field application Analogue modules Other modules Inductive sensors Photoelectric sensors Rotary encoders Accessories
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FACTORY AUTOMATION Sensor systems 2
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Sensor systems 2 AS-Interface

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