5SHY3545L0020可控硅模块,5SHY3545L0020使用数量
用于支持CPU 374的标准90-30系列3伏锂电池的预期寿命为1.2个月连续使用时。如果需要更长的电池备份时间，则外部电池模块（IC693ACC302）可用。外部电池模块为以下各项提供15个月的电池备用期：CPU374。有关更多信息，请参阅外部电池组数据表GFK-2124。覆盖未存储到闪存或EZ程序存储设备将参考数据存储到闪存或EZ程序存储设备时，不会存储覆盖。这意味着在从闪存或EZ程序存储设备读回参考数据后，然后PLC处于运行模式，逻辑可能会以不同方式执行。
5SHY3545L0020可控硅模块因此，在以下情况下不应使用覆盖：参考数据存储到闪存或EZ程序存储设备。如果使用覆盖，请特别注意应防止在通电时从闪存加载参考数据。如果不遵守此预防措施，断电后可能会发生意外操作。使用串行编程器编写Flash在将超大程序写入闪存时，可能需要增加中的请求超时值用于避免接收请求超时消息的编程软件。25秒的上限为通常令人满意。有关更多详细信息，请参阅项目“将程序或参考表存储到Flash may”第6页“以太网操作说明”中的“导致以太网通信丢失”。存储大型配置使用CPU 374的90-30系列PLC最多支持32个DSM314模块。这个数字减少了当PLC中使用其他智能模块时，如APM和GBC模块。也可以减少什么时候：■ PLC中的机架数量增加；■ 逻辑、运动和AUP文件的总大小增加；■ 应用程序使用C逻辑块或C逻辑程序；和■ 连接的编程器或HMI设备用于读取参考存储器或故障表。在某些情况下，可能会增加CPU 374将接受的DSM314模块的数量在硬件配置中，首先存储逻辑，然后单独存储配置同时加载和存储在连接多个编程器的情况下操作时，从一个编程器启动存储操作来自另一个程序员的加载操作将导致加载失败。清除参考表时，不会清除过渡表通过编程器清除参考表时，不会清除转换表。
Battery Backup Limitations
The expected life of a standard Series 90-30 3-volt lithium battery used to back up a CPU 374 is 1.2 months
when used continuously. If a longer battery backup period is required, the external battery module
(IC693ACC302) is available. The external battery module provides a battery backup period of 15 months for
the CPU374. For additional information, see the External Battery Pack datasheet, GFK-2124.
Overrides Not Stored to Flash or EZ Program Store Device
When storing reference data to flash or the EZ Program Store Device, overrides are not stored. This means
that after the reference data is read back from flash or the EZ Program Store Device and subsequently the
PLC is put into Run Mode, the logic may execute differently. Therefore, overrides should not be used if
reference data is stored to flash or to the EZ Program Store Device. If overrides are used, particular care
should be taken to prevent loading reference data from flash at power up. If this precaution is not observed,
unexpected operation may occur upon power cycle.
Writing Flash Using a Serial Programmer
When writing very large programs to flash memory, you may need to increase the request timeout value in
the programming software to avoid receiving a request timeout message. An upper bound of 25 seconds is
typically satisfactory. For further details, see the item “Store of Program or Reference Tables to Flash may
Cause Loss of Ethernet Communications” in “Ethernet Operational Notes” on page 6.
Storing Large Configurations
A Series 90-30 PLC using a CPU 374 supports a maximum of 32 DSM314 modules. This number is reduced
when other intelligent modules are used in the PLC, such as APM and GBC modules. It may also be reduced
when:
■
The number of racks in the PLC increases;
■
The total size of logic, motion and AUP files increases;
■
The application uses C logic blocks or a C logic program; and
■
Connected programmers or HMI devices are used to read reference memory or fault tables.
In some cases it may be possible to increase the number of DSM314 modules that the CPU 374 will accept
in the hardware configuration by storing logic first and then storing the configuration separately.
Simultaneous Load and Store
When operating with multiple programmers attached, initiating a store operation from one programmer during
a load operation from another programmer will cause the load to fail.
Transition Tables are not Cleared when the Reference Tables are Cleared
The transition tables are not cleared upon clearing the reference tables through the programmer.
