HDS03.2-W100N-HS79-01-FW机械设备卡件
十六进制形式的状态字，以区分高字节和低字节。高低00 00次要错误代码（高字节）成功和主要错误代码（低字节）0000信道激活（0001=信道激活，0000=信道未激活）DCS字，十六进制格式字2字1图54：解释详细信道状态字PACSystems™ RX3i，并从以太网接口返回到程序。每个梯形图程序GFK-2224Y 2019年8月编程SRTP信道命令165建立读取信道（2003）命令本章中的示例命令块。在本示例中使用了昵称，以使梯形图程序更易于遵循。LANIFOK是LAN接口状态位的第16位。可以根据需要指定所有其他昵称。PAC系统™ RX3i和RSTi EP TCP/IP以太网通信用户手册第8节GFK-2224Y 2019年8月编程SRTP信道命令166图55：COMMREQ PACSystems的梯形图逻辑示例™ RX3i和RSTi EP TCP/IP以太网通信用户手册第8节GFK-2224Y 2019年8月编程SRTP信道命令167运行#1：输入LANIFOK（LAN接口状态位的第16位）监测以太网接口的健康状况。如果可以发送COMMREQ，LAN_OK线圈打开。LAN_OK用作运行3–6的联锁。运行#2：输入BEGREAD触发READREQ，使MOVE和COMMREQ功能得以执行。READREQ是一个单触发（正转换）线圈，从指令中指示的地址开始移动到存储器中。本章的“建立读取通道示例”中定义了本示例中的常量操作数。运行#6:COMMREQ功能块。▪ IN字段指向命令块参数的起始位置（本例中为%R00301）。▪ COMMREQ功能块的SYSID字段定义以太网接口的机架和插槽，以接收命令数据。这是一个十六进制字值，给出以太网接口模块的机架（高字节）和插槽（低字节）位置。在所示的梯形图示例中，前三个数字位（从左到右）为零，不显示；只有最后一个数字4出现。这表示机架0，插槽4。▪ COMMREQ功能块的TASK字段指示用于指定机架和插槽的邮箱任务ID。对于PACSystems RX3i以太网模块，任务必须设置为0。对于PACSystems CPU嵌入式以太网接口，任务必须设置为65536（10000H）。▪ 如果有问题阻止将命令块传送到以太网接口，则FT输出（在本例中为故障线圈通电）打开（设置为1）。在这种情况下，此COMMREQ 8.4.2排序通信请求的其他状态指示器不会更新。如果以太网接口从PLC CPU接收命令块的速度快于接口处理命令块的时间，则接口将记录异常事件08，条目2=0024H，并将记录PLC故障表条目：“背板通信与PLC故障；丢失请求”每个通道一次只能挂起一个COMMREQ功能。COMMREQ函数从梯形图程序中启动时起一直挂起，直到其COMMREQ状态字被以太网接口更新为非零值。如果PLC CPU尝试将COMMREQ发送到以太网接口的速度快于以太网接口接收的速度，则COMMREQ功能块的FT输出将被设置，CPU将在PLC故障表中生成以下条目：“邮箱队列已满–COMMREQ已中止”PACSystems™ RX3i和RSTi EP TCP/IP以太网通信用户手册第8节GFK-2224Y 2019年8月编程SRTP信道命令168 PLC
status words in hexadecimal form to differentiate the high and low bytes. High Low 00 00 Minor Error Codes (high byte) Success and Major Error Codes (low byte) 0000 Channel Active (0001 = channel active, 0000 = channel not active) DCS Word in Hex Format Word 2 Word 1 Figure 54: Interpreting Detailed Channel Status Words PACSystems™ RX3i and returned to the program from the Ethernet interface. Every ladder program GFK-2224Y August 2019 Programming SRTP Channel Commands 165 Establish Read Channel (2003) command Example Command Block in this chapter. Nicknames are used in this example to make the ladder program easier to follow. LANIFOK is bit 16 of the LAN interface Status bits. All other nicknames can be assigned as needed. PACSystems™ RX3i and RSTi-EP TCP/IP Ethernet Communications User Manual Section 8 GFK-2224Y August 2019 Programming SRTP Channel Commands 166 Figure 55: Sample Ladder Logic for COMMREQ PACSystems™ RX3i and RSTi-EP TCP/IP Ethernet Communications User Manual Section 8 GFK-2224Y August 2019 Programming SRTP Channel Commands 167 Rung # 1: Input LANIFOK (bit 16 of the LAN interface Status bits) monitors the health of the Ethernet interface. If it is OK to send a COMMREQ, the LAN_OK coil is ON. LAN_OK is used as an interlock for Rungs 3–6. Rung # 2: Input BEGREAD triggers READREQ, which enables execution of the MOVE and COMMREQ functions. READREQ is a one-shot (Positive Transition) coil, moved into the memory beginning at the address indicated in the instruction. The constant operands in this example are defined in the Establish Read Channel Example in this chapter. Rung # 6: The COMMREQ Function Block. ▪ The IN field points to the starting location of the Command Block parameters (%R00301 in this example). ▪ The SYSID field of the COMMREQ function block defines the rack and slot of the Ethernet interface to receive the command data. This is a hexadecimal word value that gives the rack (high byte) and slot (low byte) location of the Ethernet interface module. In the example ladder diagram shown, the first three number places (from left to right) are zeroes and are not displayed; only the last number, 4, appears. This indicates rack 0, slot 4. ▪ The TASK field of the COMMREQ function block indicates which mailbox task ID to use for the specified rack and slot. For a PACSystems RX3i Ethernet module, Task must be set to 0. For a PACSystems CPU embedded Ethernet interface, Task must be set to 65536 (10000H). ▪ The FT output (energizes the FAULT coil in this example) is turned ON (set to 1) if there were problems preventing the delivery of the Command Block to the Ethernet interface. In this case, the other status indicators are not updated for this COMMREQ 8.4.2 Sequencing Communications Requests If the Ethernet interface receives Command Blocks from the PLC CPU faster than the interface can process them, the interface will log an exception event 08, Entry 2=0024H and will log the PLC Fault Table entry: “Backplane Communications with PLC Fault; Lost Request” Only one COMMREQ function per channel can be pending at one time. A COMMREQ function is pending from the time it is initiated in the ladder program until its COMMREQ status word has been updated to a non-zero value by the Ethernet interface. If the PLC CPU attempts to send COMMREQs to the Ethernet interface faster than the Ethernet interface can receive them, the FT output of the COMMREQ function block will be set and the CPU will generate the following entry in the PLC Fault Table: “Mailbox queue full – COMMREQ aborted” PACSystems™ RX3i and RSTi-EP TCP/IP Ethernet Communications User Manual Section 8 GFK-2224Y August 2019 Programming SRTP Channel Commands 168 The PLC
