SSR2
The device alive counter SSR2 register is located at 3X/4X address 01. SSR2 counts
upwards from 0 to 65535 and starts over. The meaning of this register is to assure that
the device is actually operating.
7.1.24 Module information
The 3X/4X Modbus address range 16...26 is reserved for providing the module
identification values to the Modbus master or client. The 3X/4X register address 16
should indicate the presence of LECM and the addresses 17...26 should display the
information about Module 1...10 respectively.
Table 120: Module identification for RIO600
Module name Module identifier value reported to Modbus master
DOM4 66
DIM8H/DIM8L 67
RTD4 68
AOM4 69
SIM8F 70
SIM4F 72
SCMH/SCM8L 71
LECM 76
The Modbus master can be informed about the RIO600 stack configuration by polling
for the addresses corresponding to the Module identification address range.
For example, in a RIO600 stack with the configuration LECM-DIM8H-DIM8L-
DOM4-RTD4, the addresses 16, 17, 18, 19 and 20 show the values 76, 67, 67, 66 and
68 respectively.
7.1.25 Modbus time synchronization
RIO600’s internal UTC time structure can be synchronized using the Modbus time
synch implementation. For this, Synch source should be set as “Modbus” in the
parameter settings for LECM. The time sent by the time synch source (Modbus
master) must be in UTC format.
3X/4X register addresses 8...13 can be read in a 3X/4X read poll to retrieve the time
stored in RIO600’s internal time structures. Using 4X register addresses 8...13, a
Modbus master or client can synchronize RIO600’s time by writing the appropriate
values to these addresses. When RIO600 time is synchronized, that is, all the time
elements are updated with the proper values, the LECM’s time synch warning is
turned off and the time synch status in WHMI indicates “Good”.
Section 7 1MRS757488 H
Modbus TCP communication
178 RIO600
Installation and Commissioning Manual
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