GE 8751-CA-NS控制模块
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COM4串行通信通信速度9600波特信号电平RS-232C连接器RJ45调制解调器支持无电气模块总线I/O容量1 x S800 I/O基本集群，最多12 x S800输入/输出单元。GE 8751-CA-NS电源电流•最大24 V–1.0 A（防短路，保险丝2 A快速）•最大5 V–1.5 A（防断路）电源电压变化24 V–跟随L+光模块的输入功率总线（2）I/O容量高达7 x S800 I/O集群，每个集群带12个单元连接器•双工光纤电缆•单工光纤电缆CEX总线（3）容量高达12个通信接口电源电流最大24 V–2.4 A（保险丝3.15 A快速）（1）PM851仅支持（CN1）以太网通信。（2） 在带有PM851的光学模块总线上，最多可以有一个S800 I/O集群。（3） 使用PM851，CEX总线上最多可以有一个通信接口。内存内容由内部或外部电池单元（SB821）备份。备份时间见第243页表50。第243页的表51显示了内部电池数据。有关外部电池数据，请参阅第392页SB821外部电池–AC 800M内存备份和第394页SB822可充电外部电池–AC800M内存备用。电磁兼容性和电气安全GE 8751-CA-NS符合EMC指令89/336/EEC中规定的要求。如果电池是在CPU正常通电后安装的，允许激活内存备份功能，则第243页表50中给出的数字有效。
COM4 Serial Communication Communication speed 9600 baud Signal levels RS-232C Connector RJ45 Modem support No Electrical ModuleBus I/O capacity 1 x S800 I/O base cluster with up to 12 x S800 I/O units. Supply current • Max 24 V – 1.0 A (short circuit proof, fuse 2 A fast) • Max 5 V – 1.5 A (short circuit proof) Supply voltage variation 24 V – follows the input power at L+ Optical ModuleBus(2) I/O capacity up to 7 x S800 I/O clusters each with 12 units Connector • Duplex Fiber Optic Cable • Simplex Fiber Optic Cable CEX-Bus(3) Capacity up to 12 communication interfaces Supply current Max 24 V – 2.4 A (fuse 3.15 A fast) (1) Only (CN1) Ethernet Communication is supported for PM851. (2) Maximum one S800 I/O cluster is possible on the optical ModuleBus with PM851. (3) Maximum one communication interface on the CEX-bus is possible with PM851.The memory content is backed up with either an internal or external battery unit (SB821). For back-up time see Table 50 on page 243. Table 51 on page 243 shows Internal battery data. For external battery data, see SB821 External Battery – AC 800M Memory Back-up on page 392 and SB822 Rechargeable External Battery – AC 800M Memory Back-up on page 394. Electro-magnetic Compatibility and Electrical Safety PM851/PM856/PM860/TP830 meets the requirements specified in EMC DirectiveGE 8751-CA-NS. The figures given in Table 50 on page 243 are valid if the batteries are installed after a normal CPU power-up, allowing for the memory back-up function to be activated.
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