GE Industrial Solutions Entellisys 5.0 Integrator's Guide - Manual (Page 8)

Control Features 8
1.1 PLC Inputs
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. These inputs can be used
to drive discrete output, begin a programmed FlexLogic sequence or operate a breaker directly.
Steps to sending a PLC Input to Entellisys
1. Configure the PLC Inputs in Entellisys: See Configuration on page 10 .
2. Program the PLC: The PLC or other 3rd party Modbus client must be programmed to write to
specific bits in the PLC Inputs State registers in the CPU Modus memory map starting at
DC00. See
PLC Input States (16 items) on page 135 . To write to a PLC input:
a. Determine which byte contains the PLC input to be updated. (See figure 1-2)
b. Read the current register value.
c. Apply a bit mask to update only relevant bits.
d. Write back to the register.
3. Test: From the 3rd party Modbus client, write to each PLC input one at a time and verify that
the correct PLC input has been toggled. See Status on page 10 .
4. Program FlexLogic: PLC Inputs must now be programmed. See Chapter 11 in DEH-501
System User’s Manual for more information on FlexLogic programming.
5. Test FlexLogic: FlexLogic changes must be tested.
PLC Inputs Registers holding state information
Each bit of the “PLC Input States” register represents one PLC input. Bit value 0 indicates the
corresponding PLC input is in off state; and bit value is 1 indicating corresponding PLC input is in
on state. See Table 1-2.
Table 1-2 PLC Input States register format
PLC Input States register PLC Input States bit field PLC Input X
1 0 1
1 2
2 3
… …
15 16
2 0 17
1 18
… …
…
16
0 241
1 242
… …
15 256