sepam 20 user manual - Schneider Electric

5
Modbus communication Presentation
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General
Modbus communication allows Sepam to be connected to a supervisor or any other
device with a master Modbus communication channel.
Sepam is always a slave station.
Sepam is connected to a Modbus communication network via a communication
interface.
There is a choice of two types of communication interface:
b communication interfaces to connect Sepam to a single network:
v ACE949-2, for connection to a 2-wire RS 485 network
v ACE959, for connection to a 4-wire RS 485 network
v ACE937, for connection to a fiber-optic star network.
b communication interfaces to connect Sepam to two networks:
v ACE969TP-2, for connection to:
- one 2-wire RS 485 Modbus S-LAN supervision communication network
- one 2-wire RS 485 E-LAN engineering communication network.
v ACE969FO-2, for connection to:
- one fiber-optic Modbus S-LAN supervision communication network
- one 2-wire RS 485 E-LAN engineering communication network.
Data available
The data available depend on the type of Sepam.
Measurement readout
b phase and earth fault currents
b peak demand phase currents
b tripping currents
b cumulative breaking current
b phase-to-phase, phase-to-neutral and residual voltages
b frequency
b temperatures
b thermal capacity used
b starts per hour and inhibit time
b running hours counter
b motor starting current and time
b operating time before overload tripping
b waiting time after tripping
b operating time and number of operations
b circuit breaker charging time.
Program logic data readout
b a table of 64 pre-assigned remote indications (TS) (depends on the type of
Sepam) enables the readout of program logic data status
b readout of the status of 10 logic inputs.
Remote control orders
Writing of 16 impulse-type remote control orders (TC) in either direct mode or SBO
(Select Before Operate) mode via 16 selection bits.
Other functions
b reading of Sepam configuration and identification
b time-tagging of events (synchronization via the network or externally via logic input
I21), time-tagging within a millisecond
b remote reading of Sepam settings
b remote setting of protection units
b remote control of the analog output (with MSA141 option)
b transfer of disturbance recording data.
PCRED301005EN - 06/2008