GE Industrial Solutions Entellisys 4.0 Integrator's Guide - Manual (Page 7)

PLC support 7
1 Integrator’s Guide
1.1 PLC support
PLCs are supported by providing status of all FlexLogic operands and discrete inputs through
the Modbus TCP interface.
PLCs have access to states of FlexLogic operands (protection elements, breaker control, status,
contact inputs/outputs, and virtual inputs/outputs) through the Modbus communication. It shall
be PLC's responsibility to figure out which CPU is running in the primary mode (Modbus register:
“FlexLogic Active”) and FlexLogic health status (Modbus register: “FlexLogic Status Message”).
CPU does not initiate communication with PLC.
1.1.1 PLC Input
PLC inputs provide the ability to manipulate FlexLogic execution. There are 256 PLC inputs, each
of which have a corresponding operand that is accessible in FlexLogic.
Writing to PLC inputs: The PLC must be programmed to write to specific bits in the PLC Input
State registers in the Modbus memory map. See
Modbus Memory Map on page 39 )
Events:
If the “Events” parameter for the PLC Input is enabled and event will be logged in the Events
screen when the state has changed. 'x' in the text of event is a placeholder for number from
range 1 to 256. Source of the events is reported as (-1).
“PLC Input x On” - logged when PLC Input transitioned from low to high state.
“PLC Input x Off” - logged when PLC Input transitioned from high to low state.