PROFIBUS DP Profile

Introduction

The LTMR controller is compliant with the Motor Management Starter (MMS) device class according to the Low Voltage Switchgear (LSVG) PROFIBUS DP profile.

The cyclic data of these devices uses edge triggered signals.

Operational States

The following diagram gives the operational states of the Motor Management Starter in normal operation.

NOTE: The pulse width must be more than 1 s.

Sequence	Description
0	Device switched OFF (no current, no internally stored switch-ON command)
1	REVERSE/FORWARD command activated
1.1	- actual or internally stored switch-ON command activated
1.2	- after a delay time, current will be measured
1.3	- a measured current in addition to the actual or internally stored switch-ON command (RUN REVERSE/FORWARD) impacts the confirmation signal RUN FORWARD/REVERSE (will be set to high)
2	OFF command activated
2.1	- the confirmation signal RUN FORWARD/REVERSE will be cleared to low
2.2	- after a motor stop, no current will be measured
2.3	- no current and no (internally) stored switch-ON command impacts the OFF signal

Type and Size of Cyclic Data

The size and type of the cyclic data exchanged depend on whether or not modules with PKW are selected during configuration.

The table below indicates the size and type of cyclic data for each module.

	Module	Inputs	Outputs
Without PKW	MMC R	10 status bytes (= 4 status words)	6 command bytes (= 3 command words)
	MMC R EV40
	MMC L
	MMC L EV40
With PKW	MMC R PKW	10 status bytes (= 4 status words) + 8 PKW in bytes (= 4 PKW in words)	6 command bytes (= 3 command words) + 8 PKW out bytes (= 4 PKW out words)
	MMC R PKW EV40
	MMC L PKW
	MMC L PKW EV40

The 8 status bytes and 6 command bytes are common to all modules.

Modules with PKW exchange 8 additional bytes dedicated to PKW function PKW: Encapsulated Acyclic Accesses in DP V0 .

Cyclic Data Format

Depending on the PLC platform used, cyclic data bytes are seen and organized differently.

To facilitate LTMR setup, cyclic data are described according to the following formats:

Byte format (used by Siemens PLCs for example)
Word little endian format (used by Premium PLCs for example)
Word big endian format (used by Siemens PLCs for example)