5SHY3545L0020可控硅模塊,5SHY3545L0020使用數(shù)量
用于支持CPU 374的標(biāo)準(zhǔn)90-30系列3伏鋰電池的預(yù)期壽命為1.2個(gè)月連續(xù)使用時(shí)。如果需要更長(zhǎng)的電池備份時(shí)間，則外部電池模塊（IC693ACC302）可用。外部電池模塊為以下各項(xiàng)提供15個(gè)月的電池備用期：CPU374。有關(guān)更多信息，請(qǐng)參閱外部電池組數(shù)據(jù)表GFK-2124。覆蓋未存儲(chǔ)到閃存或EZ程序存儲(chǔ)設(shè)備將參考數(shù)據(jù)存儲(chǔ)到閃存或EZ程序存儲(chǔ)設(shè)備時(shí)，不會(huì)存儲(chǔ)覆蓋。這意味著在從閃存或EZ程序存儲(chǔ)設(shè)備讀回參考數(shù)據(jù)后，然后PLC處于運(yùn)行模式，邏輯可能會(huì)以不同方式執(zhí)行。
5SHY3545L0020可控硅模塊因此，在以下情況下不應(yīng)使用覆蓋：參考數(shù)據(jù)存儲(chǔ)到閃存或EZ程序存儲(chǔ)設(shè)備。如果使用覆蓋，請(qǐng)?zhí)貏e注意應(yīng)防止在通電時(shí)從閃存加載參考數(shù)據(jù)。如果不遵守此預(yù)防措施，斷電后可能會(huì)發(fā)生意外操作。使用串行編程器編寫Flash在將超大程序?qū)懭腴W存時(shí)，可能需要增加中的請(qǐng)求超時(shí)值用于避免接收請(qǐng)求超時(shí)消息的編程軟件。25秒的上限為通常令人滿意。有關(guān)更多詳細(xì)信息，請(qǐng)參閱項(xiàng)目“將程序或參考表存儲(chǔ)到Flash may”第6頁(yè)“以太網(wǎng)操作說(shuō)明”中的“導(dǎo)致以太網(wǎng)通信丟失”。存儲(chǔ)大型配置使用CPU 374的90-30系列PLC最多支持32個(gè)DSM314模塊。這個(gè)數(shù)字減少了當(dāng)PLC中使用其他智能模塊時(shí)，如APM和GBC模塊。也可以減少什么時(shí)候：■ PLC中的機(jī)架數(shù)量增加；■ 邏輯、運(yùn)動(dòng)和AUP文件的總大小增加；■ 應(yīng)用程序使用C邏輯塊或C邏輯程序；和■ 連接的編程器或HMI設(shè)備用于讀取參考存儲(chǔ)器或故障表。在某些情況下，可能會(huì)增加CPU 374將接受的DSM314模塊的數(shù)量在硬件配置中，首先存儲(chǔ)邏輯，然后單獨(dú)存儲(chǔ)配置同時(shí)加載和存儲(chǔ)在連接多個(gè)編程器的情況下操作時(shí)，從一個(gè)編程器啟動(dòng)存儲(chǔ)操作來(lái)自另一個(gè)程序員的加載操作將導(dǎo)致加載失敗。清除參考表時(shí)，不會(huì)清除過(guò)渡表通過(guò)編程器清除參考表時(shí)，不會(huì)清除轉(zhuǎn)換表。
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.
