YOKOGAWA F3LR02-0N, Руководство пользователя

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B6-19
IM 34M06H45-01E 7th Edition : Aug.30, 2019-00
B6.4.2 Logging of Transmission Channel Error Location
*1
When an error occurs in a transmission channel, an error is logged and a fiber-optic
FA-bus transmission channel error location notification is generated. There are two
types of notification, namely, subunit communication error and subunit line switchover.
(1) Subunit communication error
This is an error caused by a transmission channel error or power interruption to a
substation (module installed in a subunit). Some or all substations become
inaccessible for reading and writing.
(2) Subunit line switchover
This is a state whereby communications has switched from the primary loop to the
secondary loop due to discontinuity in one wire pair of a two-pair (4-wire) fiber-optic
cable. The substations remain accessible. The program continues execution with
the ALM LED lit.
*1: Can be used with F3SP05/08/21/22/25/35 (Rev. 8 or later), F3SP22/28/38/53/58/59/66/67/71/76 and WideField3.
In this manual, when we say “a transmission channel error has occurred,” we mean
either a
“subunit communication error” or a “subunit line switchover”, as described
above, has occurred.

Special relays
The following special relays indicate the communication status of a subunit.
Category Usage
Number Name Description
M66
Subunit transmission line
normal
ON : Normal
OFF : Channel not established
*1
Channel error
M210
Subunit communication
error
ON : Error
*2
OFF : Channel not established
*1
Channel normal
M211 Subunit line switchover
ON : Error
*2
OFF : Channel not established
*1
Channel normal
*1: Indicates that the channel has never been normal since powering on.
*2: Indicates that the channel was once normal but an error was encountered later.

Special Registers
When a transmission channel error or alarm is detected by a Fiber-optic FA-bus Type 2
module, these special registers indicate the slot where the module is installed.
Category Subunit Communication Error Special Register
Number Name Description
Z89 Main unit
Z90 Subunit 1
Z91 Subunit 2
Z92 Subunit 3
Z93 Subunit 4
Z94 Subunit 5
Z95 Subunit 6
Z96 Subunit 7
Fiber-optic FA-bus Type 2 module
0: Transmission channel normal
Transmission channel not yet established
1: Transmission channel error
Slot
number
16 9 8 7 6 5 4 3 2 1
0 0
0 0 1 0 0 0 0 0
...
FB0647.VSD
...