Using The Memory Map; Reading Co Outputs; Interpreting Element Status For Breaker Contacts - GE Multilin 850 Communications Manual

CHAPTER 12: ABOUT THE MODBUS MEMORY MAP

Using the Memory Map

Reading CO Outputs

Table 12-5: Modbus Map entry, CO Outputs
Modbus Hex Description
Address Address
30706 0x02C1 CO Outputs

Interpreting Element Status for Breaker Contacts

8 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
CO Outputs are used to show the state of the output relays in the 8-Series device (internal
to the device). For example, on the 869 relay the Trip and Close contacts have voltage
monitoring inputs. The Trip and Close Circuit Monitoring feature uses the voltage input to
monitor the trip and to close coil circuit integrity.
To read the output relay status for all relays, use Modbus address 30706 (0x02C1) where
each bit corresponds to a different output relay as described in format code FC198.
Min Max
0 0xFFFFFFFF
Table 12-6: Format Code entries, CO Outputs
Code Type
FC126A unsigned 16 bits
0
1
FC198 unsigned 32 bits
Each bit corresponds to a particular output relay, and uses format FC126A
0x00000004
0x00000008
0x00000010
0x00000020
0x00000040
Element Status items with formats FE020 - FE025 are used to sense/verify the state of the
breaker contacts, external to the 8 Series device.
The following Modbus registers are assigned to Breaker Contact Element Status:
• 30765 (0x02FC) Element Status 20 (Output Relay 1)
• 30766 (0x02FD) Element Status 21 (Output Relay 2)
• 30767 (0x02FE) Element Status 22 (Output Relay 3)
• 30768 (0x02FF) Element Status 23 (Output Relay 4)
• 30769 (0x0300) Element Status 24 (Output Relay 5)
• 30770 (0x0301) Element Status 25 (Output Relay 6)
• 30771 (0x0302) Element Status 26 (Critical Fail)
These Modbus Registers are listed in the Modbus memory map table as follows:
Step Units Format
Code
1 FC198
Definition
Off / On Selection
Off
On
Output Relay Operation
Output Relay 3
Output Relay 4
Output Relay 5
Output Relay 6
Output Relay 7
USING THE MEMORY MAP
Factory Size in 8 8 8
Default Words 5 6 8
0 9 9
0 2 Y Y Y Y
850 869 889 845
Y Y Y Y
Y Y Y Y
Y Y Y Y
Y Y Y Y
Y Y Y Y
Y Y Y Y
Y Y Y Y
12-9
8
4
5