Yokogawa EJX930A - Manual (Page 137)

A6-9
IM 01C25T02-01E
Q3. On a segment where the transmitter works
as the LAS, another device cannot be
connected. How come?
A3-1. Check the following bus parameters that
indicate the bus parameter as being the LAS
for the transmitter and the capabilities of
being the LAS for the device that cannot be
connected:
• V(ST), V(MID), V(MRD) of the transmitter:
ConfiguredLinkSettingsRecord (index 369)
• V(ST), V(MID), V(MRD) of problematic
device: DlmeBasicInfo
Then, confirm that the following conditions
are met:
Transmitter Problematic
Device
V(ST) > V(ST)
V(MID) > V(MID)
V(MRD) > V(MRD)
A3-2. Check the node address of the problematic
device is not included in the V(FUN)+V(NUN)
of the transmitter.
Q4. “AL.20” is kept shown on LCD.
The LAS does not exist or is not identified in the
fieldbus network, or the transmitter is not able to
establish communication with the LAS.
A4-1. Check that the LAS is connected on the
network. When using the transmitter as the
LAS, follow the steps described in section
A6.3.
A4-2. Adjust the parameters of the LAS to that
of the transmitter. Refer to section 5.2 for
details.
LAS Transmitter
V(ST) > V(ST) 4 or above
V(MID) > V(MID) 4 or above
V(MRD) > V(MRD) 12 or above
A4-3. Check that the correct Node Address is used
for the transmitter. Refer to section 5.2 for
details.
Confirm that the Node Address of transmitter
should be out of the parameters of the LAS
of V (FUN) ~ V (FUN)+V (NUN)
Confirm that the Node Address is not within
the default address (0xF8 to 0xFB).