How to apply a publishing policy
You can apply a publishing policy globally to a Data Import Server or individually to each
gateway device.
• Apply a publishing policy to a Data Import Server to affect each gateway monitored
by that server.
• Apply a publishing policy to one gateway device to affect only the CSI 9420
transmitters connected to that gateway device.
2.4.4 Maximum network size and publishing policy settings
The maximum network size for use with Emerson's Smart Wireless Gateway is defined in
Table 2-10.
Maximum network sizeTable 2-10:
Number of wireless devices Update rate (in seconds)
12 1
25 2
50 4
100 8+
You can have up to 100 CSI 9420 devices on a single gateway, as the HART variables (i.e.
scalar values) never have an update rate faster than 60 seconds. The update rate is
typically once every 60 minutes.
The maximum network size decreases as you add different types of wireless devices to
your network and when you collect high-resolution data. For example, if 5 temperature
transmitters are broadcasting at a 1 second update rate, you will be able to add fewer CSI
9420 devices on this gateway than if the network contained only CSI 9420 devices. When
you collect high-resolution data from a CSI 9420, such as vibration spectra and waveforms,
the network can accommodate fewer wireless devices.
AMS Machinery Manager controls spectrum and waveform collection. The software
features a publishing policy that limits the amount of data broadcast from a single device
or over a single gateway. Figure 2-40 shows the menu to configure the publishing policy in
the (Modbus) Data Import program. Table 2-11 shows the recommended (default)
publishing policy settings. The default settings allow only 4 devices to send a full set of
diagnostic data in a 24-hour period and no device will send data more often than every two
weeks. This ensures that diagnostic data does not compete with process data, and that no
single device dominates the available bandwidth.
Configuration
MHM-97408, Rev 15 65
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