AS-BDEP-254模块备件

故障、可能原因和纠正措施
R（un）和F（ault）
指示灯不亮
CI852板正在重新启动，或
配置。留出时间完成这项工作。
如果条件持续存在，并且CEX总线上的所有单元都具有
非照明LED：
•检查包括CI852在内的有效硬件配置是否：
下载到控制器。
•检查PM8xx处理器单元内的CEX总线保险丝。
•从PM8xx处理器启动复位信号（INIT）
单元
•更换CI852装置。
F（故障）指示灯点亮。使用Control Builder软件请求状态信息
从CI852单元开始，并相应地进行：
•从PM8xx处理器启动复位信号（INIT）
单元
•更换CI852装置。
第5节维护基金会现场总线H1–CI852
3BSE036351-510 A 211
一个或多个字段
设备似乎
迟钝
回应或
完全死了
网络
问题是
证明
难解
1.一种装置可以是：
•地址不正确。
•连接极性不正确。
•故障并导致故障或重载
网络
2.现场总线电缆可以：
•因短路、断路或接地而损坏
（可能是间歇性的）。
•错误终止。
•包含因不正确而具有相反极性的部分
连接。
•由于损坏或损坏导致电源电压下降
连接。
3.网络电源可能有故障。
•纠正网络电源。
考虑工厂内可能的活动，如
作为维护或维修工作，可能导致
问题完全排除此可能性后，按以下步骤进行：
通过以下方式检查供电网络中的直流电源电压：
输入电容小于的数字电压表
1000pF。
表32.基金会现场总线H1 CI852——故障查找（续）
故障、可能原因和纠正措施
基金会现场总线H1–CI852第5节维护
212 3BSE036351-510 A
网络
问题是
证明
难解
（续）。
使用示波器检查以下通信信号：
异常。
•示波器必须为差分或电池
操作类型。
•探头必须具有至少1 MOhm的输入
电阻和小于1000pF的输入电容。
断开网络的各个部分，包括以太网端口
通过PM8xx处理器单元，直到其尺寸减小到：
功能正常。
•应使用手持式现场总线主单元来
网络中不同点的连接。
•通过重新连接
一次一节。在坏的情况下
有必要逐个移除设备，以识别
有缺陷的项目。
•可使用欧姆表（电阻）检查电缆
数字电压表的功能。隔离电源
并在进行检查之前断开所有其他设备。
•对于大型网络，网络分析仪应：
雇佣。分析仪必须适用于：
基金会现场总线网络。Fault Possible Cause and Corrective Action
 R(un) and F(ault)
LEDs are not ON
The CI852 board is in the process of being restarted or
configured. Allow time for this to finalize.
If the condition persists, and all units on the CEX-Bus have
non-illuminated LEDs:
• Check that a valid HW configuration including the CI852 is
downloaded to the controller.
• Check the CEX-Bus fuse inside the PM8xx processor unit.
• Initiate a reset signal (INIT) from the PM8xx processor
unit.
• Replace the CI852 unit.
F(ault) LED is ON Use the Control Builder software to demand status information
from the CI852 unit and proceed accordingly:
• Initiate a reset signal (INIT) from the PM8xx processor
unit.
• Replace the CI852 unit.
Section 5 Maintenance FOUNDATION Fieldbus H1 – CI852
3BSE036351-510 A 211
One or more field
devices appear to
be slow to
respond or
completely dead
The network
problem is
proving very
difficult to solve
1.A device may be:
• Incorrectly addressed.
• Connected with incorrect polarity.
• Faulty and causing breakdown or heavy loading of the
network.
2. The fieldbus cable may:
• Be damaged causing a short-circuit, breaks or grounding
of the data wires, (possibly intermittent).
• Be incorrectly terminated.
• Contain sections having reversed polarity due to incorrect
connections.
• Cause supply voltage drops due to damage or bad
connections.
3. The network power supply may be faulty.
• Rectify the network power supply.
Give consideration to possible activities within the plant, such
as maintenance or repair work, which may be causing the
problem. Having totally ruled this out, then proceed as follows:
Check the DC supply voltage in powered networks by means of
a digital voltmeter having an input capacitance of less than
1000 pF.
Table 32. FOUNDATION Fieldbus H1 CI852 – Fault-Finding (Continued)
Fault Possible Cause and Corrective Action
FOUNDATION Fieldbus H1 – CI852 Section 5 Maintenance
212 3BSE036351-510 A
The network
problem is
proving very
difficult to solve
(continued).
Use an oscilloscope to check the communication signals for
abnormalities.
• The oscilloscope must be of differential or battery
operated type.
• Probes must have a minimum of 1 MOhm input
resistance, and less than 1000 pF input capacitance.
Disconnect sections of the network, including the Ethernet port
via the PM8xx processor unit, until it is reduced to a size that
functions correctly.
• A hand-held fieldbus master unit should be used to make
connections at different points in the network.
• Locate the unserviceable section by reconnecting the
sections one at a time. In the worst possible case, it may
be necessary to remove devices one by one to identify the
faulty item.
• Cables can be checked using the ohmmeter (resistance)
function of a digital voltmeter. Isolate the power supply
and disconnect all other devices before making the check.
• For large networks, a network analyzer should be
employed. The analyzer must be suitable for use on
FOUNDATION Fieldbus networks.