INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 10)

10
tira56e1 (2010-02) PxG55x.cp
3 General Data
Via the Profibus interface, the following and further data are exchanged in the
standardized Profibus protocol:
• Pressure
reading
• Pressure unit (Torr, mbar, Pa)
• Zero / Gain adjustment
• Status and error messages
• Status of the switching functions
Caution
Caution: data transmission errors
Any attempt to simultaneously operate the gauge via the RS232C
Serial Interface and a Fieldbus interface (DeviceNet or Profibus) or the
diagnostic port may result in incorrect data and data transmission
errors.
Therefore, it is inadmissible to simultaneously operate the gauge via
the RS232C Serial Interface and DeviceNet, Profibus, or the diag-
nostic port.
For operating the gauge via Profibus, prior installation of the PxG55x specific GSD
file is required on the bus master side. This file can be downloaded from our web-
site (www.inficon.com).
The node address is a unique device address on a Profibus network. The gauge
can only communicate with the network if its node address has been set properly.
The valid address range is 0 … 125 in decimal form.
In the PxG55x, the node address must be set in hexadecimal form (00 … 7D
hex
).
Two rotary switches at the back of the gauge are used for this:
4
2 6
0 8
E A
C
LSD MSD
ADDRESS
4
2 6
0 8
E A
C
The MSD switch is used to set the high-order address nibble
The LSD switch is used to set the low-order address nibble
The default node address setting is 01
hex
.
Example: Node address = 7D
hex
:
MSD
8
6
LSD
E
C
The node address is polled by the firmware when the gauge is switched on. If the
setting deviates from the stored value, the new value is taken over into the
nonvolatile memory.
If a value >7D
hex
(>125
dec
) is entered, the node address setting currently stored in
the device remains valid. However, the address can now be set via the Profibus
master with the "Set Slave Address" service.
3.1 Introduction
3.2 Operating Software
3.3 Node Address