Siemens CP-8021 User Manual

System Components and Technical Data
122 Unrestricted SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual
DC8-037-2.02, Edition 10.2017
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
1)
─ 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“
2)
• 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
3)
─ RS-422 - balanced interface according V.11 standard
3)
─ 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

Siemens CP-8021 Specifications

General

Brand	Siemens
Model	CP-8021
Category	Controller
Language	English