GUID-8FE88A9A-20F7-4AE8-A2CF-CED69016B575 V1 EN
Figure 4: Write and read coil example
The state of the physical output is wired to an MVGAPC input. The MVGAPC “Mom-
only” signal alternative is chosen for the Modbus indication. The MVGAPC user-
definable address is configured as 100. SPCGAPC output is wired to the physical
output. The writable coil address is also adjusted to 100. Alternatively, the physical
output state (XGGIO) Modbus signal could be mapped to coil address 100. However,
this signal contains also the MCD bit, so the indication would then cover two coil
addresses, 100 and 101.
3.4.7 System status registers
The Modbus SSRx 16 bit system status registers are located at the beginning of the
regular Modbus map at addresses 40128...40133. The regular Modbus map starts from
register location 128. See the Modbus memory map for the actual locations of SSRx
registers. The SSRx registers can also be read from the 3X register area from
corresponding register addresses.
Table 17: System status registers
Register
Description Address
SSR1 Device health 40128
SSR2 Device mode 40129
SSR3 Data available 1 40130
SSR4 Data available 2 40131
SSR5 Device alive counter 40132
SSR6 Last command result 40133
3.4.7.1 SSR1
The device health SSR1 register is located at address 40128. The bits in SSR1 are
common for all Modbus clients. The bits in SSR1 give an overview of the IED health.
Section 3 1MRS757645 B
Vendor-specific implementation
38 620 series
Communication Protocol Manual
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