Siemens SPC3 Specifications download pdf (Page 23)

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

DU Byte 1 (New_Slave_Add, 0-125)

76543210

XXXXXXXX

DU Byte 2 (Ident_Number for security check, High Byte)

76543210

XXXXXXXX

DU Byte 3 (Ident_Number for security check, Low Byte)

76543210

XXXXXXXX

The identification number (Ident_Number) is used to establish a

reference between a slave and its corresponding GSD file. This number is

assigned by the ProfiBus Trade Organization and cannot be changed. It is

used here for security purposes--if the ident_number does not match that of

the slave, the address will not be changed. Note that only class 2 masters

do not require an ident_number.

DU Byte 4 (LOCK - Enable/Disable Further Address Changes)

76543210

XXXXXXXX

00H = False/Unlocked, Change of address possible later.

01H = True/Lock, No further address changes possible

To unlock an Acromag module for address changes, set the external

switches to 255 (FFH) prior to applying power and this will clear the lock bit

and restore the internal EEPROM setting to 126. Next, simply set the

switches as desired from 0-125, or to 126 if you intend to use the Set-

Slave_Address command, and re-power the unit.

The parameter Status can be tested to indicate if the Set_Slave_Add

request frame was sent successfully and accepted by the slave. However,

the acknowledgement does not indicate whether the new values were

actually accepted by the slave. A master can check the correct execution of

this function by using Slave_Diag with the new DP-slave address and then

testing Status for the possible values of: OK, DS, NA, RS, RR, UE, and RE.

After completion of the power-on initialization routine and after the

slave’s address has been set to a valid address from 0-125, the slave will

proceed to the Wait_Prm state (Wait for Parameterization).

After the slave completes its power-on initialization routine and its

address has been set to a valid address from 0-125, the slave will proceed

to await the Parameterization Telegram (Set_Prm) from the master which

serves to identify the master for the slave and specify the slave’s operating

mode. The slave address must already be set to a valid address from 0-125

for a master to perform parameterization (Set_Prm). If the slave address is

instead set to 126, then it will await the Set Slave Address command before

proceeding. While awaiting the parameterization telegram, a slave will reject

all other telegrams except Slave_Diag or Get_Cfg.

Parameterization

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Siemens SPC3 Specifications Page 23

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