Yokogawa EJX930A - Manual (Page 143)

A6-9
IM 01C25R03-01E
Q3. On a segment where an EJX 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 EJX and the capabilities of being the
LAS for the device that cannot be connected:
• V(ST), V(MID), V(MRD) of EJX:
ConfiguredLinkSettingsRecord (index 369)
• V(ST), V(MID), V(MRD) of problematic
device: DlmeBasicInfo
Then, confirm that the following conditions
are met:
EJX 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 EJX.
Q4. “AL.20” is kept shown on LCD.
The LAS does not exist or is not identified in the
fieldbus network, or the EJX is not able to establish
communication with the LAS.
A4-1. Check that the LAS is connected on the
network. When using the EJX as the LAS,
follow the steps described in section A6.3.
A4-2. Adjust the parameters of the LAS to that of
the EJX. Refer to section 5.2 for details.
LAS EJX
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 EJX. Refer to section 5.2 for details.
Confirm that the Node Address of EJX
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).