2.2.2 Important amplifier configuration parameters
The following parameters configure the amplifier for the Profibus interface. They can be set using
the setup software for the amplifier.
EXTWD (PNU 1658)
With this parameter, the observation time (watch dog) for the fieldbus-slot communication can be
set. The observation is only active, if a value higher than 0 is assigned to EXTWD (EXTWD=0,
observation switched off) and the output stage is enabled. If the set time runs out, without the
watchdog-timer being newly triggered by the arrival of a telegram, then the warning n04 (response
monitoring) is generated and the drive is stopped. The amplifier remains ready for operation and the
output stage enabled. Before a new driving command (setpoint) is accepted, this warning must be
deleted (function CLRFAULT or INxMODE=14).
ADDR (PNU 918)
With this command, the node address of the amplifier is set. When the address has been changed,
all parameters should be saved to the EEPROM and the amplifier switched off and on again.
Since the modular structure of the S400 as a multi-axis system requires its own addressing, there is
the additional parameter ADDRFB (PNU 2012) for this series, with which a field bus address differ
-
ent from the internal device address (ADDR) can be defined. As long as ADDRFB = 0, ADDR is
the bus address. If ADDRFB > 0, then ADDRFB is the bus address. ADDR is set automatically by
the S400 master module in descending order.
AENA (PNU 1606)
With this parameter, the state of the software-enable after switch-on can be defined. The soft-
ware-enable allows an external control to enable/disable the output stage. For amplifiers with ana-
log setpoints (OPMODE=1,3) the software-enable is set automatically after switch-on and the
devices are ready for operation immediately (if hardware-enable is present). For all others, soft-
ware-enable will be set to the value of AENA. The variable AENA also has functionality when reset-
ting the amplifier after an error (by digital input 1 or the CLRFAULT command). If an error can be
reset by the software, the software-enable is set to the value of AENA after the error is cleared. In
this way the behavior of the amplifier after a software-reset is similar to after the drive is switched
on.
INPT, INPT0 (PNU 1904)
With INPT (S300/S700: INPT0) a delay for the in-position message can be set. With the start of a
motion task the in-position message is deleted and the monitoring of the position is activated after
expiration of the adjusted time. This function is particularly important for positioning procedures
within the in-position window. In this case the in-position message is delayed for a defined time.
14 PROFIBUS for S300/S400/S600/S700
Installation / Setup 04/2017 Kollmorgen
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