Efficient Networks S120 manual Setting criteria for times, Minimum times for reserves

			Communication PROFIBUS DP/PROFINET IO
			10.2 Communication via PROFIBUS DP
Name	Value1)	Limit value	Description
MSG			Acyclic service
			After cyclic transmission, the master checks whether the token
			hold time has already expired. If not, another acyclic DPV1
			service is transmitted.
RES			Reserve: "Active pause" until the isochronous cycle has expired
R			Processing time for speed or position controller
TM			Master time
			This is the time from the start of the position controller cycle to
			the start of master closed-loop control.
GAP			Attempt to open connection with new node.
			This attempt takes place every xth cycle.
TJ			TJ returns the duration of the cycle jitter.
			The cycle jitter is the delay of the GC telegram.

1) The values correspond to device master file si0280e5.gs_

Setting criteria for times

●Cycle (TDP)

–TDP must be set to the same value for all bus nodes.

–TDP > TDX and TDP ≧ TO

TDP is thus large enough to enable communication with all bus nodes.

NOTICE

After TDP has been changed on the PROFIBUS master, the drive system must be switched on (POWER ON) or the parameter p0972=1 (Reset drive unit) must be set.

●TI and TO

–Setting the times in TI and TO to be as short as possible reduces the dead time in the position control loop.

–TO > TDX + TOmin

●A tool is available for setting and optimization purposes (e.g. HW Config in SIMATIC S7). The following must be noted:

–Configuring reserves allows the following: Class 2 masters can be connected Non-cyclic communication

Minimum times for reserves

Table 10-32 Minimum times for reserves
Data	Time required [µs]
Basic load	300
Per slave	20

Drive Functions	419
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4