Efficient Networks S120 manual 418

Communication PROFIBUS DP/PROFINET IO 10.2 Communication via PROFIBUS DP

Name	Value1)	Limit value	Description
TO	4	TDX + TO_MIN	Time of setpoint transfer
		≤ TO ≤ TDP	This is the time at which the transferred setpoints (speed
			setpoint) are accepted by the closed-loop control system after
			the start of the cycle.
			TO = integer multiple of TBASE_IO
			Servo calculation: TO = 4 ∙ TBASE_IO = 500 µs
			When TO = 0: TO ≐ TDP
			Vector calculation: TO = 4 ∙ 1000 µs = 4000 µs
			When TO = 0: TO ≐ TDP
			TO corresponds to the largest speed controller cycle (p0115[1])
			of a drive object (vector) in the drive unit.
		TO_MIN = 1	Servo:
			Minimum time distance between TO and TDX
			TO_MIN = 1 ∙ TBASE_IO = 125 µs
			Vector:
			Minimum time distance between TO and TDX
			TO_MIN = 1 ∙ Tn_reg = 1000 µs
			Tn_reg corresponds to the largest speed controller cycle
			(p0115[1]) of a drive object (vector) in the drive unit.
TDX	E10 hex	TDX < TDP	Data exchange time
	≐		This is the time required within one cycle for transferring
	3600 dec		process data to all available slaves.
			TDX = integer multiple of TBit
			TBit = 1/12 µs at 12 MBaud
			calculation: TDX = 3600 • TBIT = 300 µs
TPLL_W	0	-	PLL window
			(half the width of the GC synchronization window)
			The following applies to the setting:
			• Small window --> minimization of synchronization
			fluctuations on the drive
			• Large window --> higher tolerance of GC fluctuations
			Calculation (assumption: TPLL_W = A hex ≐ 10 dez)
			TPLL_W = 10 • TBIT = 0.833 µs
			TBit = 1/12 µs at 12 Mbps
TPLL_D	0	-	PLL dead time
			The PLL dead time can be used to compensate for different
			data transfer times to the slaves (e.g. due to repeaters).
			The slaves with faster transfer times are delayed by a
			corresponding PLL dead time.
			Calculation: TPLL_D = 0 ∙ TBIT = 0 µs
			TBit = 1/12 µs at 12 MBaud
GC			Global Control Telegram (Broadcast Telegram)
TTH			Token hold time
			This time is calculated by the engineering system.
Dx			Data_Exchange
			This service is used to implement user data exchange between
			master and slave 1 - n.

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