（如IEC 60664-1中所定义），海拔高达2000米（6562英尺），无需降额。
本设备不适用于居住环境，可能无法为无线电提供足够的保护
此类环境中的通信服务。
该设备作为开放式设备提供。它必须安装在适当设计的外壳内
将存在的特定环境条件，并适当设计，以防止
带电部件的可访问性。外壳必须具有适当的阻燃性能，以防止或尽量减少火焰蔓延，
符合5VA的火焰蔓延额定值，如果是非金属材料，则应获得批准。外壳内部必须
只能使用工具访问。本出版物的后续章节可能包含有关特定
符合某些产品安全认证要求的外壳类型额定值。
除本出版物外，请参见以下内容：
•工业自动化布线和接地指南，罗克韦尔自动化出版物1770-4.1，用于附加安装
要求
•NEMA标准250和IEC 60529（如适用），用于解释外壳提供的防护等级
The card provides 8-bit access to objects in the short address space and 8- and 16-bit access to objects in the standard address space. The VME master selects whether a particular bus cycle accesses short, standard, extended, or long (extended and long are not used on the card) address spaces, and the type of access, through the use of the address modifier codes. The card decodes these address modifier codes and determines the object to be accessed. In addition to selecting one of four spaces available on the VMEbus, address modifier codes also select: • Whether the master is making a supervisory or non-privileged access • Whether the access is to program or data space (for all but short address space accesses) • Whether it is to be a single-object or block access The card can respond to address modifier codes 0x03D, 0x039, 0x02D, and 0x029. Supervisory or non-privileged data accesses may be made to standard address space (0x03D and 0x039 respectively). Supervisory or non-privileged accesses may be made to short address space (0x02D and 0x029 respectively). An access to the card with an address modifier code that is not supported causes a VMEbus error. Position 7 of the card's DIP switch selects whether only supervisory accesses or both supervisory and non-privileged accesses are permitted. The following table shows the switch positions.
客服1