INFICON BCG450 ATM to Ultra-High Vacuum Triple Gauge - Manual (Page 40)

40
tina40e1-b (2011-04)
This interface allows operation of BCG450-SP with part number
353-554 and
353-556
in connection with other devices that are suited for Profibus operation. The physical
interface and communication firmware of BCG450-SP comply with the Profibus
standard (
→ [7], [5].
Two adjustable switching functions are integrated in the BCG450-SP. The corre-
sponding relay contacts are available at the sensor cable connector
(
→ 8, 20, 41).
The basic sensor and sensor electronics of all BCG450 gauges are identical.
Caution
Caution: data transmission errors
The attempt to operate the BCG450-SP with the RS232C interface
causes data transmission errors.
The BCG450-SP must not be operated with the RS232C interface.
Via this interface, the following and further data are exchanged in the standardized
Profibus protocol (
→ [2]):
• Pressure reading
• Pressure unit (Torr, mbar, Pa)
• Degas
function
• Status and error messages
• Status of the switching functions
As the DeviceNet protocol is highly complex, the parameters and programming of
BCG450-SP are described in detail in the separate Communication Protocol
(
→ [2]).
For operating the gauge via Profibus, prior installation of the BCG450 specific GSD
file is required on the bus master side. This file can be downloaded via internet
(
→ [3]).
For unambiguous identification of the gauge in a Profibus environment, a node
address is required. The node address setting is made on the gauge.
The node address (0 … 125
dec
) is set in hexadecimal form
(00 … 7D
hex
) via the "ADDRESS", "MSD", and "LSD" switches.
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 NVRAM. If a value >7D
hex
(>125
dec
) is entered, the node address setting currently stored
in the device remains valid but it can now be defined via
Profibus ("Set slave Address",
→ [2]).
Default address setting is 5C
hex
.
The gauge is connected to Profibus via the 9-pin Profibus connector ( → 22).
4.10 Profibus Interface
(BCG450-SP)
4.10.1 Description of the
Functions
4.10.2 Operating Parameters
4.10.2.1 Operating Software
4.10.2.2 Node Address Setting
Electrical connections