P12x/EN T/Eb6 - Schneider - error

CommunicationsP12x/EN CT/Eb6MODBUS DatabaseMiCOM P120/P121/P122/P123 Page 52.2 MODBUS functions of the MiCOM relaysProtection device data may be read or modified by using function codes. Following are theavailable function codes. Function codes to read from or write into parameter cells in theprotection device are described in the listed following table.Function Nr. Data Read Data Write Data Format & Type1 X N bits2 X N bits3 X N words4 X N words5 X 1 bit6 X 1 word7 Fast 8 bits8 X Diagnostics counter11 X Event counter15 X N bits16 X N words2.3 Presentation of the MODBUS protocolMaster slave protocol, all exchange understands a master query and a slave responseFrame size received from MiCOM P120, P121, P122 and P123 relays2.3.1 Frame size received by the protection device (slave)Frame transmitted by the master ( query):Slave number Function code Information CRC161 byte 1 byte n bytes 2 bytes0 à FFh 1 à 10hSlave number:The slave number is situated between 1 and 255.A frame transmitted with a slave number 0 is globally addressed to all pieces of equipment(broadcast frame )Function code:Requested MODBUS function (1 to 16)Information:Contains the parameters of the selected function.CRC16:Value of the CRC16 calculated by the master.NOTE:The MiCOM relay does not respond to globally broadcast frames sentout by the master.