Granville-Phillips Mini-Convectron 275 Series, Installation, Operation And Service Instructions, Page: 28 / 52

20 Mini-Convectron
®
Module with DeviceNet
®
Digital Interface
Chapter 4
4.5 DeviceNet Digital
Interface
Installation Use the following procedure to install the 275 Mini-Convectron Vacuum
Gauge (with DeviceNet digital interface) on the vacuum system and obtain
a vacuum chamber pressure.
1. Set the MAC ID switches on the 275 Mini-Convectron Vacuum Gauge
Module to the correct address position for the vacuum chamber on
which it is installed.
2. Set the data rate switch to the appropriate setting.
3. Connect the DeviceNet network cable to the connector 275 Mini-
Convectron Vacuum Gauge Module.
4. Turn the DeviceNet power supply ON.
Refer to the Series MICRO-ION and Mini-Convectron Gauge Module
DeviceNet Programmer’s Guide , P/N 354022, for additional
information on firmware configuration.
5. Allocate a connection for the 275 Mini-Convectron Vacuum Gauge
Module to the network master as listed in Table 4-2 and Table 4-3.
An explicit message connection must be allocated to allow a polled
connection to be allocated. They may be allocated simultaneously as
shown in Table 4-2.
6. Configure the expected packet rate for the explicit and polled
connections, as listed in Table 4-4.
The default explicit message expected packet rate is 2.5 seconds. If data
is requested as a slower rate, this must changed to prevent the
connection from expiring. See Table 4-4 to disable the expected packet
rate
7. Proceed with Configuring Polled I/O Data Format .
Table 4-2 Network Master Connection
Parameter Service Class Instance
Allocation
Choice
Master ID
Connection 4B
hex
3 1 3* 0 to 63
* Allocation Choice = 3 allocates a polled and explicit message connection.
Table 4-3 Allocation Choice Byte Contents
7* 6* 5* 4* 3* 2* 1 0
Reserved Acknowledge
Suppression Cyclic Change
of State Reserved Bit
Strobed Polled Explicit
Message
* Not Supported, Value = 0 only.
Table 4-4 Disabling the Expected Packet Rate
Parameter Service Class Instance Attribute Data
Service 10
hex
5 1* 9 0
* 1 = Explicit connection 2 = Polled Connection