Modmt2, Modst0; Functions - Siemens CP-8000 User Manual

System Components and Technical Data
5.5.8

MODMT2, MODST0

5.5.8.1

Functions

Communication between one central station and up to 100 substations (MODBUS).
Central Station
·
Serial communication according to Modicon MODBUS
MODMT2 is central station
·
MODBUS protocol with half duplex link transmission procedure
─ MODBUS RTU mode
·
Max. connections (number of supported MODBUS Slaves): 100
─ max. number of SICAM FCMv2 devices per interface without SICAM FCMv2 parame-
ter loading: 100
─ max. number of SICAM FCMv2 devices per interface with SICAM FCMv2 parameter
loading: 5
·
Message protection
─ CRC16 + parity (optional) "RTU mode"
·
Network Configurations
─ Point-to-point
─ Multiple point-to-point (extra interface required for each point-to-point configuration)
─ Multipoint-partyline
─ Multipoint-star
─ Data concentrator
·
MODBUS Slave address 0 "broadcast"
·
MODBUS Slave addresses 1...247
·
Physical Interface
─ RS-232 - unbalanced interface according V.24/V.28 standard
─ RS-485 - balanced interface according V.11 standard
─ RS-422 - balanced interface according V.11 standard
─ Transmission line (half duplex)
·
Interoperability according to the following documents:
─ SICAM RTUs MODBUS Interoperability (DC0-073-2)
·
Acquisition of events (transmission of data ready to be sent)
·
General interrogation, outstation interrogation
·
Clock synchronization for selected MODBUS Slave Devices
─ Clock synchronization - selectable for each MODBUS Slave
─ Clock synchronization for SICAM FCM
·
Optimized parameters for selected transmission facilities (modems)
─ Predefined optimized parameters for selected transmission facilities
─ Free definable parameters for transmission facility
─ 5 V power supply for external modem
ATTENTION: check power consumption of external modem!
·
Protocol element control and return information
─ Protocol element return information
─ Station status
─ Station failure
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Unrestricted
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SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual
DC8-037-2.02, Edition 10.2017