23
The bit-interpretation of the Input Register 0x01 error register is shown below, the bits 0 to 14 are not
used, but it can be read without limitation, while .bit15 shows the Watchdog MODBUS error.
9.
BASIC MODBUS-RTU REGISTER MAP
The table shown in this chapter is our exclusive and original register map with the name of the
function and their address.
Furthermore to the register map itself, it is important to understand the relationship between Error
words (Holding Register 0x20) and Instantaneous alarms (Input Register 0x01).
There is also a direct relationship between Holding Register 0x20 and Input Register 0x01. While
Holding Register 0x20 is the total alarms latched, the Input Register 0x01 is the current alarm. This
relationship also applies to the bit-to-bit relation between registers. Only the Watchdog alarm has
been implemented, which means that the Latched alarms and instantaneous alarms, always match.
To reset the alarm errors, it is necessary to reset it from the Holding Register 0x20 and not from Input
Register 0x01, due to, the Input Register 0x01 will reset when the current error alarm disappears. To
reset all the alarms, it is necessary to set to 0 from Coil 0x200 to 0x20F. Note: a disconnection of the
power supply will reset all the latched alarms.
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