Hitachi ABB RVT Installation Und Betriebsanleitung Seite 626

Address space Data
0XXXX Output bit
1XXXX Input bit
3XXXX Input word
4XXXX Output word
5.3. Supported function codes
The following table gives the Modbus functions, which are implemented and supported.
The code is the one used in function field of the Modbus message.
The address space concerned and the purpose of the function are given below.
Code Function
1 Read Coil Status
2 Read Input Status
3 Read Holding Registers
4 Read Input Registers
5 Force Single Coil
6 Preset Single Register
7 Read Exception Status
8 Diagnostics
11 Fetch Comm. Event Ctr.
12 Fetch Comm. Event Log
15 Force Multiple Coils
16 Preset Multiple Registers
17 Report Slave ID
22 Mask Write 4X registers
23 Read/Write 4X registers
6. Data access
6.1. Access levels
Some access levels must be set to allow parameters to be changed. Here are some access levels used in the RVT.
SET MODE: The RVT must be in the Set Mode to allow parameter modifications.
LOCKING SWITCH: the locking switch has to be released
BANK SETTINGS: the parameter bank settings must be set as Unlocked (for more information on these settings,
please refer to the RVT Installation and Operating manual).
Another parameter (COMMUNICATION LOCK) is used to add access rights to Modbus users.
The access levels of the Modbus writings are coded in the Modbus data table.
STATUS
Approved
Readable/writable
Read & write
Read
Read
Read & write
Address range/remark
0XXXX Reads the on/off status of discrete outputs
1XXXX Reads the on/off status of discrete inputs
4XXXX Reads contents of output registers
3XXXX Reads contents of input registers
0XXXX Sets the status of a discrete output
4XXXX Sets the value of a holding register
Device specific (see Modbus data table of a device)
Checks the communication system between the master and the slave
Returns amount of successful read/write operations on data points
Returns log registers of communication events
0XXXX Sets the status of multiple discrete outputs
4XXXX Sets the value of multiple holding registers
Device specific (see Modbus data table of the device)
4XXXX And/Or write of a holding register
4XXXX Reads a set of holding registers and writes a set of holding regis-
ters in one query
SECURITY LEVEL
Public
Modbus name
Coil Status
Input Status
Input Register
Holding Register
DOCUMENT ID
9AKK107045A9895
RS 48 5 A DAPTE R
REV. LANG. PAGE
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