產(chǎn)品細(xì)節(jié):TRICONEX 4119A 增強(qiáng)型智能通信模塊(EICM)

型號(hào)4119A增強(qiáng)型智能通信模塊(EICM)允許Tricon與Modbus主站和從站進(jìn)行通信
1131，還有打印機(jī)。
對于Modbus連接，EICM用戶可以選擇RS-232點(diǎn)對點(diǎn)接口作為一個(gè)主站和一個(gè)從站，或者RS-485接口作為一個(gè)主站和最多32個(gè)從站。RS-485網(wǎng)絡(luò)中繼可以是一根或兩根雙絞線，最長可達(dá)4000英尺(1200米)。
每個(gè)EICM包含4個(gè)串行端口和1個(gè)并行端口，可以并發(fā)操作。每個(gè)串口可以配置為Modbus主機(jī)，每個(gè)Tricon最多可配置7個(gè)Modbus主機(jī)
底盤。單個(gè)Tricon系統(tǒng)最多支持2個(gè)eicm, eicm必須位于一個(gè)邏輯槽位。
(EICM不支持熱備功能，但可以在控制器在線時(shí)更換故障的EICM。)每個(gè)串行端口都是的地址，并支持Modbus或trstation接口。

Modbus通信支持RTU和ASCII兩種模式。并行端口提供Centronics接口到打印機(jī)。每個(gè)EICM支持57.6千比特/秒的總數(shù)據(jù)速率(對于所有四個(gè)串行端口)。
Tricon的程序使用變量名作為標(biāo)識(shí)符，但Modbus設(shè)備使用稱為別名的數(shù)字地址。因此，必須為每個(gè)將被Modbus設(shè)備讀取或?qū)懭氲腡ricon變量名分配別名。別名是一個(gè)五位數(shù)字，表示Modbus消息類型和Tricon中變量的地址。在trstation 1131中分配了一個(gè)別名號(hào)碼。
只要為Tricon變量別名，任何標(biāo)準(zhǔn)Modbus設(shè)備都可以通過EICM與Tricon通信。當(dāng)主機(jī)通過其他通信模塊(如NCM)訪問Tricon時(shí)，也必須使用別名號(hào)。有關(guān)更多信息，請參閱第61頁的“通信能力"。

The Model 4119A Enhanced Intelligent Communication Module (EICM) allows the Tricon to communicate with Modbus masters and slaves, TriStation
1131, and printers.
For Modbus connections, the EICM user can select the RS-232 point-topoint interface for one master and one slave, or the RS-485 interface for one master and up to 32 slaves. The RS-485 network trunk can be one or two twisted-pair wires up to a maximum of 4,000 feet (1,200 meters).
Each EICM contains four serial ports and one parallel port which can operate concurrently. Each serial port can be configured as a Modbus master with up to seven Modbus masters per Tricon
chassis. A single Tricon system supports a maximum of two EICMs, which must reside in one logical slot.
(The hot-spare feature is not available for the EICM, though you can replace a faulty EICM while the controller is online.) Each serial port is uniquely addressed and supports either the Modbus or TriStation interface.

Modbus communication can be performed in either RTU or ASCII mode. The parallel port provides a Centronics interface to a printer. Each EICM supports an aggregate data rate of 57.6 kilobits per second (for all four serial ports).
Programs for the Tricon use variable names as identifiers but Modbus devices use numeric addresses called aliases. Therefore an alias must be assigned to each Tricon variable name that will be read by or written to a Modbus device. An alias is a five-digit number which represents the Modbus message type and the address of the variable in the Tricon. An alias number is assigned in TriStation 1131.
Any standard Modbus device can communicate with the Tricon through the EICM, provided that aliases are assigned to the Tricon variables. Alias numbers must also be used when host computers access the Tricon through other communication modules, such as the NCM. See “Communication Capabilities" on page 61 for more information.

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