HIEE 320639R0001工控模块备件
可以在应用程序中用于将数据读写到PACSystems PLC或其他EGD Class 2设备中。这些是一次性操作，而EGD交易所是重复的定期操作。以太网接口最多支持10个同时EGD命令。6.2在冗余系统中使用EGD命令当两个以太网接口仅为冗余IP配置时，活动单元使用冗余IP地址发送或响应EGD命令。备份单元不发送或响应冗余IP地址。如果备份单元试图发送EGD命令，COMMREQ错误状态将返回到其应用程序。如果活动以太网接口更改为备份状态，它将关闭所有使用冗余IP地址的可靠数据报服务（RDS）会话。当发生角色切换时，冗余IP地址上当前正在处理的任何EGD命令都将结束。虽然不推荐，但EGD命令可以发送到直接IP地址。活动和备份单元将响应在直接IP地址接收的EGD命令。（远程主机在与冗余系统通信时应使用冗余IP地址。）6.3编程EGD命令的COMMREQ格式本章中描述的EGD命令使用通信请求（COMMREQ）功能发送。当逻辑程序向COMMREQ功能块通电时，会触发通信请求。图43显示了COMMREQ格式示例：图43：COMMREQ梯形图PACSystems示例™ RX3i和RSTi EP TCP/IP以太网通信用户手册第6节GFK-2224Y 2019年8月编程EGD命令112对于EGD命令，COMMREQ的参数为：命令描述ENABLE激活COMMREQ功能块的控制逻辑。IN命令块的位置。命令块包含COMMREQ请求的参数。它可以位于PACSystems PLC中面向字的内存区域（%R、%AI、%AQ、%P、%L或%W）内的任何有效地址。EGD命令的参数在以下页面中描述。SYSID一个十六进制字值，用于给出以太网接口的机架（高字节）和插槽（低字节）位置。例如，机架0插槽6中的以太网接口将使用此参数的值6。对于PACSystems CPU嵌入式以太网接口，输入CPU模块的机架/插槽位置。TASK对于PACSystems CPU嵌入式以太网接口，任务必须设置为值65536（10000H），以寻址CPU的以太网子板。对于PACSystems以太网模块，任务必须为
can be used in the application program to read and write data into PACSystems PLCs or other EGD Class 2 devices. These are one-time operations whereas EGD Exchanges are repetitive, periodic operations. The Ethernet interface supports a maximum of 10 simultaneous EGD commands. 6.2 Using EGD Commands in a Redundancy System When two Ethernet interfaces are configured for a Redundant IP only the active unit sends or responds to EGD commands using the Redundant IP address. The backup unit does not send or respond to the Redundant IP address. If the backup unit tries to send an EGD command, a COMMREQ error status is returned to its application program. If the active Ethernet interface changes to backup status, it takes down all reliable datagram services (RDS) sessions that use the Redundant IP address. Any EGD command currently in process over the Redundant IP address when a role switch occurs is ended. Although not recommended, EGD commands may be issued to the direct IP address. The active and backup units will respond to EGD commands received at the direct IP address. (Remote hosts should use the Redundant IP address when communicating to a redundant system.) 6.3 COMMREQ Format for Programming EGD Commands The EGD commands described in this chapter are sent using the Communications Request (COMMREQ) function. The Communications Request is triggered when the logic program passes power to the COMMREQ Function Block. Figure 43 shows a sample COMMREQ format: Figure 43: Sample COMMREQ Ladder Diagram PACSystems™ RX3i and RSTi-EP TCP/IP Ethernet Communications User Manual Section 6 GFK-2224Y August 2019 Programming EGD Commands 112 For the EGD commands, the parameters of the COMMREQ are: Command Description ENABLE Control logic for activating the COMMREQ Function Block. IN The location of the Command Block. The Command Block contains the parameters of the COMMREQ request. It can be located at any valid address within a word-oriented memory area (%R, %AI, %AQ, %P, %L, or %W) in the PACSystems PLC. Parameters for the EGD commands are described on the following pages. SYSID A hexadecimal word value that gives the rack (high byte) and slot (low byte) location of the Ethernet interface. For example, an Ethernet interface in rack zero, slot six would use the value 6 for this parameter. For the PACSystems CPU embedded Ethernet interface, enter the rack/slot location of the CPU module. TASK For the PACSystems CPU embedded Ethernet interface, Task must be set to the value 65536 (10000H) to address the CPU’s Ethernet daughterboard. For a PACSystems Ethernet module, Task must be
