1MRS750881-MUM REC 52353Remote Monitoring and Control UnitTechnical Reference ManualIn REC 523, the ABB-specific solution for substation communication is supportedby foreign messages. In short, the communication method consists of session control(REC 523 can maintain up to 4 sessions), a sliding window protocol for applicationacknowledgement and definition of data formats.The REC 523 unit also supports explicit SPA messages which may be used forparametrization purposes. This method is also defined in the LON ApplicationGuidelines document.6.4.1. Network variable indexes of REC 523Table 6.4.1-1 Network variable indexesNVindex Dir. SNVT_Type SNVTnumberObjectType Comments0...15 IN SNVT_state 83 16 bit INT Virtual IEC 61131 inputs(Relay Configuration Tool def.COMM_IN_1...16)16...31 OUT SNVT_state 83 16 bit INT Virtual IEC 61131 outputs(Relay Configuration Tool def.COMM_OUT_1...16)32... 47 IN SNVT_state 83 16 bit INT Virtual IEC 61131 inputs (RelayConfiguration Tool def.COMM_IN_17...32)48... 63 OUT SNVT_state 83 16 bit INT Virtual IEC 61131 outputs(Relay Configuration Tool def.COMM_OUT_17...32)64 IN SNVT_elapsed_tm 87 structure Throttle input(see description in text)65 IN SNVT_elapsed_tm 87 structure Timeout input(see description in text)66 OUT SNVT_alarm 88 structure Alarms to receiver 167 OUT SNVT_alarm 88 structure Alarms to receiver 268... 77 OUT SNVT_state 83 16 bit INT User-definable outputsLM_STA_x (generated frominternal process value types1,2,3 or 16 bits)78... 87 OUT SNVT_count_inc_f 52 IEEE754floatUser-definable outputsLM_CNT_x (generated frominternal process value typefloat)88... 97 OUT nv_32bit_analog 252 32 bit INT User-definable outputsLM_ANA_x (generated frominternal process value type 32bit (=any type))100...115IN SNVT_state 83 16 bit INT Virtual IEC 61131 inputs (RelayConfiguration Tool def.COMM_IN_33...48)116...131OUT SNVT_state 83 16 bit INT Virtual IEC 61131 outputs(Relay Configuration Tool def.COMM_OUT_33...48)