Specifications

16 GX Configurator-PN

From CPU to PROFINET IO-Controller

Global Variable Identifiers

IO-Device

Number

Values

0 (default)

vPN_MGMT_OUTPUTS.IOD_CONSIST[16]

…

vPN_MGMT_OUTPUTS.IOD_CONSIST[31]

…

vPN_MGMT_OUTPUTS.IOD_CONSIST[116]

…

vPN_MGMT_OUTPUTS.IOD_CONSIST[127]

116

127

Therefore station-specific handshake flags are added to the shared memory, which block simulta-

neous access to the same input or output area by both the master and the PLC program. This solu-

tion is slower, but has the following advantages:

1. IO-controller checks the configuration to detect stations, which require consistency

2. it marks those stations, which require consistency for inputs and outputs.

3. handshake controls access to each station separately, not blocking simultaneous access to all

stations

The disadvantage of this solution is the delay between two updates data from PLC.

Note: PLC CPU and PROFINET Controller cannot write to the same area in shared memory. There-

fore the handshake mechanism requires to define two bits for device inputs and two bits for device

outputs.

Output Handshake Registers (IOD_OUTPUT_HSK_Y and

IOD_OUTPUT_HSK_X)

From CPU to IO-Controller

Global Variable Identifier

Function

vPN_MGMT_OUTPUTS.IOD_OUTPUT_HSK_Y[0]

Take into account new outputs for

device 0

…

Take into account new outputs for

device n

vPN_MGMT_OUTPUTS.IOD_OUTPUT_HSK_Y[127]

Take into account new outputs for

device 127