3BSE028588R1使用流程，ABB处理器模块
当使用CommReq打开到远程服务器的Modbus/TCP通道时，如果初始CommReq返回AA90状态，未来可能返回Open命令A890状态。这表明本地网络资源已经已使用，无法用于进一步的连接尝试。如果发生这种情况，则在进行下一次连接之前，应用程序必须等待至少60秒企图这将允许释放并提供网络资源对于下一个Modbus Open命令。
3BSE028588R1使用流程Modbus/TCP请求数据包Modbus/TCP服务器希望以分离TCP数据包。如果在单个数据包中发送多个请求，则服务器可能会也可能不会对每个请求发送响应。如果将响应发送到客户端，它们将在单独的TCP数据包中发送。RMS后EGD生产延迟EGD的当运行模式存储添加或修改生成的EGD交换时只有经过一个生产周期后，才能生产exchange运行模式存储完成后。
当通过车站管理器的PING从PLC启动ICMP回显请求时，车站管理器PING命令命令时，操作偶尔会失败，并记录异常（事件eH，条目2=6H）。
车站管理器“referr”计数EGD车站管理器“referr”计数可在以下情况下增加两次：发生交换超时。Exchange状态字报告工作正常，并且未受影响。“wkal_idle”AUP参数应不允许零“wkal_idle”（TCP保持活动计时器）允许为零，但它是无效值。如果出现以下情况，TCP连接可能会提前超时：超时设置为10分钟以上如果TCP连接超时设置高于10分钟，则连接可能会中断配置值之前超时。连接超时来自三个AUP参数：wkal\u空闲+（wkal\u cnt+1）*wkal\u intvl。符合FCC 47 CFR 15和EN55011 A类辐射发射的安装要求限制，以太网电缆应屏蔽。
When using a CommReq to open a Modbus/TCP Channel to a remote server, if
the initial CommReq returned an AA90 status, future Open Commands may return
an A890 status. This indicates that local networking resources have been
consumed and are not available for further connection attempts. If this occurs, the
application must wait at least 60 seconds before making the next connection
attempt. This will allow networking resources to be released and made available
for the next Modbus Open Command.
Modbus/TCP request packets The Modbus/TCP server expects to receive each Modbus/TCP request in a
separate TCP packet. If multiple requests are sent in a single packet, the server
may or may not send a response to each request. If responses are sent to the
client, they will be sent in separate TCP packets.
EGD production delayed after RMS
of EGD
When a produced EGD exchange is added or modified by a Run-mode Store, the
exchange will not be produced until one production period of time has elapsed
after the completion of the run-mode store.
Station Manager PING commands When initiating ICMP echo requests from the PLC via Station Manager’s PING
command, the operation occasionally fails and an exception is logged (Event eH,
Entry 2 = 6H).
Station Manager “referr” tally The EGD Station Manager “referr” tally may be incremented twice when an
exchange timeout occurs. Exchange status word reporting works correctly and is
not impacted.
“wkal_idle” AUP parameter should
not allow zero
Zero is allowed for the “wkal_idle” (TCP keep alive timer) but it is an invalid value.
TCP connection may time out early if
the timeout is set above 10 minutes
If the TCP connection timeout is set higher than 10 minutes, the connection may
timeout before the configured value. The connection timeout is derived from three
AUP parameters:
wkal_idle + (wkal_cnt + 1) * wkal_intvl.Installation Requirements For compliance with FCC 47 CFR 15 and EN55011 Class A Radiated Emissions
limits, Ethernet cables should be shielded.
