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Reliance 57c443a接口模块
PCM钴个砞）底板髯讯逾时值为5秒。PCM向CPU发送请求后，PCM在等待CPU返回响应时应用此超时。在里面大多数情况下，CPU将在5秒超时内做出良好响应；然而，在某些情况下，CPU可能需要5秒以上的时间以响应。这些情况仅限于程序的加载或存储和/或配置-特别是当程序中的块大于8 KB。包含EXE块的文件夹（同样是*.EXE文件>8KB）最有可能导致问题。
确保PCM不要观察背板超时，必须加载文件（使用termf）到PCM。该文件必须是名为CPU.ENV的二进制文件。
这个该文件的内容如下（所有值都在十六进制）：一旦二进制文件CPU。ENV（如下）已创建，请使用termf加载CPU。ENV至PCM。然后执行PCM软复位。
之后执行软复位，PCM背板通信超时时间应为10秒。
注意安全CPU。执行硬重置时，将不使用ENV文件在PCM上。使用CPU。ENV文件驻留在PCM中，软件每次PCM硬复位后必须执行复位。是意识到可以从梯形图应用；
因此，应用程序可以修改为在电源关闭后处理所需的PCM复位定时器操作注意定时器（ONDTR、TMR和OFDTR）用于并非每次扫描都调用的程序块中。
计时器在子块调用之间累积时间，除非它们被重置。
这意味着它们的功能类似于在程序中使用扫描速度比主程序块中的定时器慢得多。
对于长时间处于非活动状态的程序块应该以这样一种方式进行编程，以解释此捕获向上功能。
与此相关的是由于使用JUMP指令。
跳过的计时器将无法赶上并将因此，不要像以前那样积累时间执行每次扫描。
恒定扫描恒定扫描时间（使用时）应至少设置为10大于正常扫描时间毫秒，以避免监测或执行在线更改时出现任何过扫描情况程序员。如果扫描设置不够高。一致的过扫描条件可能导致编程器与RX7i失去通信。
大量COMMREQ发送到一次扫描中的模块会导致故障发送给相同扫描中的给定板可能会导致模块软件故障记录在控制器故障表中。
故障组为MOD_OTHR_SOFTWR（16t，10h），错误代码为COMMREQ_MB_FULL_START（2）。发生这种情况时，“FT”输出也将设置功能块的。为了防止这种情况，发给给定板的COMMREQ应分布在多个扫描，以便只有有限数量（通常为8或更少）的COMMREQ在每次扫描中发送到给定的板。
此外应检查FT输出参数是否有错误。如果FT输出为设置（表示检测到错误），COMMREQ可以是由应用程序逻辑重新发布。
communications timeout
The PCM has a default backplane communications timeout value of 5 seconds. After the PCM has sent a request to the CPU, the PCM applies this timeout while waiting on a response back from the CPU. In most cases, the CPU will respond well within the 5–second timeout; however, in certain instances the CPU can take longer than 5 seconds to respond. These cases are limited to LOADs or STOREs of program and/or configuration -especially if blocks in the program are larger than 8 KBytes. Folders containing EXE blocks (again with *.EXE files >8 KBytes) are most likely to cause problems. To ensure that the PCMs do not observe backplane timeouts, a file must be loaded (using termf) to the PCM. The file must be a binary file named CPU.ENV. The contents of this file are as below (all values are specified in hexadecimal): Once the binary file CPU.ENV (below) is created, use termf to load CPU.ENV to the PCM. Then execute a soft reset of the PCM. After executing the soft reset, the PCM’s backplane communications timeout should be 10 seconds. CAUTION The CPU.ENV file will not be used when a hard reset is performed on the PCM. With the CPU.ENV file resident in the PCM, a soft reset must be performed after every hard reset of the PCM. Be aware that it is possible to issue a soft reset COMMREQ from the Ladder Diagram application; therefore, the application can be modified to handle the required reset of PCMs after a power cycle of the system
Timer operation
Care should be taken when timers (ONDTR, TMR, and OFDTR) are used in program blocks that are NOT called every sweep. The timers accumulate time across calls to the sub-block unless they are reset. This means that they function like timers operating in a program with a much slower sweep than the timers in the main program block. For program blocks that are inactive for large periods of time, the timers should be programmed in such a manner as to account for this catch up feature. Related to this are timers that are skipped because of the use of the JUMP instruction. Timers that are skipped will NOT catch up and will therefore not accumulate time in the same manner as if they were executed every sweep.
Constant sweep
Constant Sweep time, when used, should be set at least 10 milliseconds greater than the normal sweep time to avoid any oversweep conditions when monitoring or performing on-line changes with the programmer. Window completion faults will occur if the constant sweep setting is not high enough. A consistent over sweep condition can cause the programmer to lose communications with the RX7i. Large number of COMMREQs sent to module in one sweep causes faults A large number of COMMREQs (typically greater than 8) sent to a given board in the same sweep may cause Module Software faults to be logged in the Controller fault table. The fault group is MOD_OTHR_SOFTWR (16t, 10h) and the error code is COMMREQ_MB_FULL_START (2). When this occurs, the “FT” output of the function block will also be set. To prevent this situation, COMMREQs issued to a given board should be spread across multiple sweeps so that only a limited number (typically 8 or less) of COMMREQs are sent to a given board in each sweep. In addition, the FT output parameter should be checked for errors. If the FT output is set (meaning an error has been detected), the COMMREQ could be re-issued by the application logic.
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