Operation options
FieldGate SWG50
22
Hauser
Channel
Frequency
6
2430
7
2435
8
2440
9
2445
10
2450
11
2455
12
2460
13
2465
14
2470
15
2475
7.1.6
Caching commands
The FieldGate SWG50 stores a number of commands in the cache. The validity of the stored
data depends on the
Stale Data Timer
Command
Description
3, 778
These commands are used to fill the
Devices
page in the web server and in the Modbus
register. It is expected that most field devices will burst these commands. The gateway
generates a request to update this cached data if it is older than 1/3 of the
Stale Data
Timer
interval. For this reason, the "Stale Data Timer" interval should be set to three
times the burst rate of the field devices.
If the burst rate of the field devices is one minute, the "Stale Data Timer" interval
should be set to three minutes.
1, 2, 9, 42, 48, 76, 89, 93,
95, 512, 769, 779, 781,
796, 798, 804, 808, 810,
817, 822, 833, 1793, 1794
These commands are cached by the gateway. If this data is older than the
Stale Data
Timer
interval, the gateway forwards a request to the field device and renews the cached
data.
0, 7, 8, 11, 12, 13, 14, 15,
16, 20, 21, 35, 74, 75, 84,
101, 105, 774, 776, 778
These commands are cached by the gateway and regarded as "static". They are updated
only if an update is triggered by a HART command.
The receipt of a CMD 22 (Write Long Tag) response generates a CMD 20 (Read
Long Tag) request.
0, 48
If these commands are sent from a HART IP client to a field device, the cached value is
bypassed and a request is sent directly to the field device.
Summary of Contents for FieldGate SWG50
Page 2: ......
Page 12: ...Mounting FieldGate SWG50 12 Endress Hauser A0048928 5 Mounting on a standard DIN rail ...
Page 13: ...FieldGate SWG50 Mounting Endress Hauser 13 Mounting the device 1 A0048933 ...
Page 45: ......
Page 46: ......
Page 47: ......