Identifier
The identifier used to identify the mapping item. This will be the same as for the
“60870-5-104 Configuration tab.
Slave address
The slave address to sent the Modbus request to.
word address
The Modbus address [hex] is the slave address space from where to retrieve the
Modbus object.
bit index
For types that are bit oriented this indicates the bit to read or write at the word
address in the Modbus slave.
Delta-even
When used, there will only be an IEC60870-5-104 event created when the
received object value differs more then the Delta-even value. This is only used
when "Only send events on changes" is set to "yes". Only valid for 'input' direction.
Type
This is the type of Modbus item to retrieve and corresponds to the Modbus
function codes. This can be one of:
◦
FC1 –
Read
Single Coil
▪
FC1 → read a single coil register
◦
FC3 –
Read
Holding Registers
▪
FC3(x) → read 1 16 bit Modbus holding register
▪
→ x from 1 to 8 (if 32 bit, x must be even ; 2,4,6,8)
◦
FC4 –
Read
Input Registers
▪
FC4(x) → read x 16 bit Modbus holding register
▪
→ x from 1 to 8 (if 32 bit, x must be even ; 2,4,6,8)
◦
FC5 –
Write
Single Coil
▪
FC5(1) → write 0x0000 or 0xFF00 to a single coil
◦
FC6 –
Write
Single Holding Register
▪
FC6(1) → write 0x0000 to 0xFFFF to a single holding register
◦
FC16 –
Write
Multiple Holding Register
▪
FC16(2) → write 0x00000000 to 0xFFFFFFFF to a double holding register
direction
The direction, input for reading from, output for writing to the slave.
