FINS Addressing

This topic describes the FINS addressing format as used by the RMC. For other addressing formats, see the Register Map Overview topic.

The FINS address format must be used when communicating with the RMC75E or RMC150E via the FINS protocol.

Address Format

The RMC memory uses the D and E memory areas. The FINS addressing assigns a single number to each register in RMC memory. In the FINS protocol, the addresses are 0-based. Because the FINS protocol is 16-bit based, and the RMC has 32-bit registers, the addresses of RMC registers are even.

The RMC interprets the current E memory as the first extended memory E0_. For example, E01200 is interpreted as E0_01200.

Determining FINS Addresses

To obtain the address of RMC registers in FINS format, use the Register Maps. The maps provide the FINS address for each register.

In addition, you can use the utility or calculation below to determine the FINS address, given the IEC address.

Manual Calculation

The FINS address is calculated according to the following equation:

Examples:

%MD12:3 = 2 x [(256 x 12) + 3] = 6150. Therefore, the address is D06151.

%MD9:56 = 2 x [(256 x 9) + 56] = 4720. Therefore, the address is D04721.

%MD64:5 = 2 x [(256 x 64) + 5] = 32778. 32778-32768 = 10. Therefore, the address is E00010.

Low Address Range

In addition to the standard FINS register map, which is calculated from the IEC register map as described above, the RMC70 and RMC150 duplicate some FINS registers to lower address ranges. Some PLCs do not address high enough to access critical data. The lower addresses allow all PLCs to access RMC data.

FINS Address Sections

For your convenience, the starting registers of each register section are given below:

See Also

Register Map Overview