Mapping of the Fieldbus Box modules

The Modbus process image makes a fundamental distinction between digital and byte-oriented (word-oriented) signals. Additionally, a distinction is made between inputs and outputs. The Coupler Box has a modular mapping, which consists of the different extensions.

Bit oriented Fieldbus Box modules

Bit oriented Fieldbus Box modules have a fixed number of input and/or output data. These can not be changed.

Module	Inputs [Bit]	Modbus Function	Outputs [Bit]	Modbus Function
IP10xx-B8x0 IE10xx	8	read 2, 3, 4, 23	-	-
IP20xx-B8x0 IE20xx	-	-	8	read 1, 3, 4, 23 write 5, 6, 15, 16, 23
IP23xx-B8x0 IE23xx	8 (High-nibble is not used, last 4 Bits)	read 2, 3, 4, 23	8 (High-Nibbel is not used, last 4 Bits)	read 1, 3, 4, 23 write 5, 6, 15, 16, 23
IP240x-B8x0 IE240x	8	read 2, 3, 4, 23	8	read 1, 3, 4, 23 write 5, 6, 15, 16, 23

Byte oriented Fieldbus Box modules

Byte oriented Fieldbus Box modules can be parameterized differently. The table shows the default setting.

Module	Inputs [Bit]	Modbus Function	Outputs [Bit]	Modbus Function
IP15xx-B730 IE15xx	6	read 3, 4, 23	6	read 3, 4, 23 write 6, 16, 23
IP25xx-B730 IE25xx	6	read 3, 4, 23	6	read 3, 4, 23 write 6, 16, 23
IP3xxx-B730 IE3xxx	8	read 3, 4, 23	-	-
IP41xx-B730 IE41xx	-	-	8	read 3, 4, 23 write 6, 16, 23
IP5xxx-B730 IE5xxx	6	read 3, 4, 23	6	read 3, 4, 23 write 6, 16, 23
IP6xxx-B730 IE6xxx	4	read 3, 4, 23	4	read 3, 4, 23 write 6, 16, 23

Memory partitioning

For the digital functions there is an input and an output process image is available. For all complex signals (all Bus Terminals or modules that are connected with a byte or more into the Insert process image) a process image is available. Anhand der Offset Adresse wird unterschieden zwischen Eingang (Offset 0x0000) und Ausgang (0x0800) - see Modbus Interface.