Siemens SPC3 Specifications download pdf (Page 21)

Introduction To ProfiBus DP

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Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:sales@acromag.com http://www.acromag.com

Status Value Description

AD Access denied.

IP Invalid parameter.

SC Sequence conflict.

SE Sequence error.

NE Area Non-existent.

DI Data incomplete.

NC Master parameter set not compatible.

Refer to EN 50170 for more information on function status codes.

Recall that a ProfiBus DP slave must pass through 3 other states prior

to the Data Exchange state: Power On/Reset, Parameterization, and I/O

Configuration. Each DP slave state and the related function telegrams are

described in the following paragraphs. Refer to EN 50170 Volume 2 for a

more detailed explanation.

In the initial state following power up, the slave initializes itself and

automatically detects the correct baud rate for communication. If a valid

address from 0-125 has been set, the slave will pass to the parameterization

state. However, if the slave’s address is set to 126 (the default

commissioning address), then the slave will await a “Set_Slave_Address”

telegram from a class 2 master to change its station address before

proceeding to the parameterization state. A class 2 master can use SAP 55

(Set_Slave_Add) in a telegram header to change the address of a slave

following power-up, but only if the slave’s Set_Slave_Address lock bit is clear

and it has the default address of 126. Recall that stations whose address

cannot be set externally will have a default address of 126 and this address

can only be changed with a class 2 master device.

So that the slave address does not have to be reassigned after power-

up, this address is normally stored in non-volatile memory and uploaded

upon initialization, or it may be loaded from switches on the unit. If there are

several similar stations whose address cannot be set externally and have a

default address of 126, be sure to connect them to the network one at a time

in order to set their addresses.

The important point about initialization is that the slave address must be

set to a valid address from 0-125 (either through external switches or via the

Set_Slave_Address command from a class 2 master) in order for the slave

to pass from the initialization state to the parameterization state.

From the factory, Acromag modules have a default address of 126.

However, address 126 may not be used for data exchange, as it is reserved

for the purpose of commissioning. Acromag modules have external

switches for setting the slave address, but also support address changes via

the Set_Slave_Address command when the external switches are preset to

126 and the internal EEPROM address is also 126. If the unit is instead

powered-up with the external address switches set from 0-125, the

Set_Slave_Address request is refused with an RS error message. If the unit

is powered-up with the external address switches set to 126, then the unit

will retrieve its address from the internal EEPROM memory.

Function Status

OPERATING STATES

AND APPLICABLE

FUNCTIONS

Initial Power ON/Reset

The address must be set to a

valid address from 0-125 in

order for the slave to pass to

the parameterization state.

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Siemens SPC3 Specifications Page 21

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