XAC77 Profibus-DP
®
6.3 Modes of operation
Profibus-DP devices allow operation using different communication modes (see
Figure below):
NOTE
All parameters -except for the
- are transmitted in Set_Prm mode.
is transmitted only in Data_Exchange mode.
Types of communication
Transmission of data between Master and Slave is carried out using the
following types of messages:
•
DDLM_Set_Prm:
Used for configuring the slave. This communication mode is active
immediately after power is turned ON and used to send parameters from
Master to Slave (see section “6.4 DDLM_Set_Prm“).
•
DDLM_Chk_Cfg:
Sets the number of bytes used for data transmission in Data_Exchange
mode (see section “6.5 DDLM_Chk_Cfg“).
•
DDLM_Data_Exchange:
Used as "standard operation mode".
Used by Master to send the
; used by Slave to transmit position
and velocity values (see section “6.6 DDLM_Data_Exchange“).
•
DDLM_Slave_Diag:
Used when power is turned on and whenever Master needs to know
diagnostic information from Slave device (see section “6.7
DDLM_Slave_Diag“).
MAN XAC77 PX I_E 1.0.odt
43
Profibus® interface
Power-ON
Wait_Prm
Wait_Cfg
Data_Exchange
Chk_Cfg_OK
Set_Prm_OK
Set_Prm_FAIL
Chk_Cfg_FAIL
Init_OK