WirelessHART Fieldgate SWG70
Modbus Interface
E Hauser
117
Fig. 16-1: Mapping of Modbus registers Fieldgate SWG70
Refresh time
Fieldgate SWG70 refreshes Modbus discrete inputs and input registers once every macro-
cycle. The length of the macrocycle depends on the number of WirelessHART devices in the
network, the response time of the devices and the number of parameters they transmit.
• In general, shorter refresh times can be attained by restricting the traffic over the network
to essential parameters only.
0
65535
Coils
(not supported
by Fieldgate)
Discrete Inputs
Input registers
Holding registers
(in Fieldgate, an RO image
of the input registers)
1
65536
100001
165536
300001
365536
400001
465536
Re
g
is
te
r
Re
fe
re
n
ce
addr
ess
RW
RO
RO
RW
0
65535
0
65535
0
65535