System Status Registers; Ssr1 - ABB Relion 620 Series Protocol Manual

Section 3
Vendor-specific implementation
3.4.7
3.4.7.1
38
Modbus memory map
Write-only addr 100
Coil
100
Read-only addr 100
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.

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

SSR1

SSR2
SSR3
SSR4
SSR5
SSR6
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.
Application configuration
SPCGAPC
MVGAPC
Description
Device health
Device mode
Data available 1
Data available 2
Device alive counter
Last command result
1MRS757645 B
Physical
output
Address
40128
40129
40130
40131
40132
40133
620 series
Communication Protocol Manual