System Configuration
36 ATM60 / ATM90 / KHK53
Dec 2021
8 System Configuration
8.1 Master-Slave Communication
With the DP protocol (V0) supported by the encoder, a subscriber (DP slave) behaves accord-
ing to the following flow diagram scheme (State Machine). The mode of operation of the State
Machine is fully defined in a hardware component (DP controller ASIC).
To start a data exchange with the slave the master must, during run-up, adhere to the following
order of telegrams:
• DDLM_Slave_Diag (diagnostic request).
• DDLM_Set_Slave_Adr (optional telegram, Master Class 2 only).
• DDLM_Set_Prm.
• DDLM_Chk_Cfg.
• DDLM_Slave_Diag (diagnostic request to ensure initialisation).
• DDLM_DATA_EXCH (cyclical data exchange)
Via a diagnostic telegram DDLM_Slave_Diag, the master can request an appropriate diagnosis
from the slave, at any time.
Further services may be activated via "Global Control Command (GCC)" telegrams.
Figure 8–1: DP State Machine
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