<9. Connection Device Type>
9-1
IM 01W03D02-01EN
This section describes the detailed information of
each device connecting to the FN310. Refer to the
subsection of the corresponding device.
9.1 SENCOM
This subsection describes the detailed information
when DT2 is specified in the connection device
type. SENCOM FU20F/FU24F/SC25F Digital
pH/ORP-sensor (hereafter simply referred to as
SENCOM) is used by connecting to the FN310.
FN310 transmits the various measurement value
such as pH, ORP, rH and temperature acquired
from SENCOM to the host system. When
temperature compensation is required, perform
processing by the host system.
NOTE
• When replace SENCOM for maintenance,
remove the battery pack at first.
• When the startup time of the SENCOM
is longer than the time-out of the device
configuration tool, an error may occur. At
that time, reconnect the tool to get the value.
For startup time of the SENCOM, refer
to the Startup time, Response time and
Stabilization time of General Specifications
of SENCOM (GS 12B06J03-04E-E).
9.1.1 Cable Selection
Use the dedicated cable WU11 SENCOM cable
provided by Yokogawa. For details of the cable,
refer to General Specifications of SENCOM (GS
12B6J3-04E-E).
9.1.2 Connecting Input Terminal and
Grounding Terminal
Connect SENCOM as shown in Figure 9.1.
F0901.ai
1 2 3 4 5 6
SENCOM
WU11 SENCOM cable
82 (black)
83 (yellow)
84 (green)
86 (white)
87 (brown)
Figure 9.1
Connection of SENCOM
9.1.3 Preparation for Starting Operation
■ Setting the FN310
Confirm the following settings of the FN310.
SENCOM Interface block: Transmitter Status Alert
Mask
Set the impedance error to detect when the sensor
status changes. When detecting the state of the
target and the setting is enabled, FN310 sends
alert.
■ SENCOM
Perform the calibration before connecting
SENCOM. For details of the calibration, refer to
General Specifications of SENCOM (GS 12B6J3-
04E-E).
9.1.4 Parameters for Wireless
Communication
Update Time
CO block: Data publication period
Set the update time value to 8 to 3600 seconds.
The setting affects the battery life.
When update time is set 0 second, FN310 stops
updating process variables via the field wireless
network. And it also stops the acquisition of process
variables from SENCOM.
When set the update time shorter than 241
seconds, FN310 supplies power continuously to
SENCOM.
9.1.5 SENCOM Specific Parameters
SENCOM Interface block: Stable Time
Stable Time is defined as the time until the reliable
data is available. The unit is second. This value
is depending on the liquid temperature of the
measurement target. When the FN310 supplies
power continuously, this value is zero.
FN310 returns a response after acquiring reliable
data. When the liquid temperature to be measured
is low, time-out of the device configuration tool may
occur. At that time, set the update time of FN310 to
241 seconds or less to supply power continuously.
9. Connection Device Type
