ABB UNS2881B-P自动化控制模块

产品详细资料
读回命令读回命令允许用户查看定时器计数、定时器模式、OUT引脚的当前状态和所选定时器的加载标志。与控制字一样，回读命令被写入控制字寄存器，格式如表4-7和4-8所示。该命令适用于通过设置相应位Cnt2、Cnt1、Cnt0=1而选择的计时器。通过设置计数位=0并选择计时器，可使用读回命令来锁存多个计时器计数。这与使用多个定时器锁存命令相同。同样，每个计时器的锁存计数将被保持，直到其被读取。读回命令还可用于通过设置状态位=0并选择计时器来锁定计时器状态。计时器的状态可通过读取该计时器来访问（见第55页表4-1）。如果发出多个计时器状态读回命令而未读取状态，则将忽略除个命令之外的所有命令。计时器状态字节的格式如表4-9和4-10所示。
Read-Back Command The Read-Back Command allows the user to view the Timer Count, the Timer Mode, the current state of the OUT pin, and the Load Flag of the selected Timer. Like a Control Word, the Read-Back Command is written into the Control Word Register and has the format shown in Tables 4-7 and 4-8. The Command applies to the Timer(s) selected by setting the corresponding bits Cnt2, Cnt1, Cnt0 = 1.The Read-Back Command can be used to latch several timer counts by setting the Count bit = 0 and selecting the Timers. This is the same as using multiple Timer Latch Commands. Again each Timer’s latched count will be held until it is read. The Read-Back command can also be used to latch the timer status by setting the Status bit = 0 and selecting the Timers. Status of a Timer is accessed by a read from that Timer (see Table 4-1 on page 55). If more than one Timer Status Read-Back command is issued without reading the status, all but the first are ignored. The format of the Timer Status byte is shown in Tables 4-9 and 4-10.
主营产品简介
专注于DCS、PLC、机器人控制系统、大型伺服四大系统领域。

主营产品各种模块/卡件，控制器，触摸屏，伺服驱动器。

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●使用前:

在操作和维护，安装设备之前，请阅读并严格遵守安全相关的信息。

Read and strictly follow safety-related information before operatingmaintainingand installing equipment.

●使用者要求:

必须从事安装，组装或维护设备等相关工控电气机械以及其他相关技术的人员。

Must be engaged in the installation,assembly or maintenance of equipment and other related industriacontroeectrica machinery and other related technica personne.应用范围:

应用于品牌本系列工业以及生产生活自动化设备产品。

Used in the brand of this series of industriaand production automation eauipment products

适用于场景:系统集成，非标定制，产线升级改造，原设备电气替换等等。

Suitable for scenarios:system integration,non-standard customizationproduction line upgrading and transformation,electrical replacement of original equipment,etc.

●操作人员:

应该由本品牌专业培训操作员来安装、操作和维修设备。专业人员具有技术能力强，熟悉安全信息和安全实施:

熟悉设备的安装加工、操作和维护:熟悉处理所有的潜在危险情况。

Equipment should be installed,operated and maintained by trained operators from the brand

●危险情况

警告

.请注意使用人员的人身安全。

●除了产品特性以及功能，还需了解产品的使用寿命环境。

●充分学习产品使用手册，否则非专业人员可能会造成人身危险。

Study the product instruction manual thoroughlyotherwise it may cause personal danger to non-professionals.

●服务行业

适用水泥，木业，石业，橡胶，石油，化工，发电，环保，水处理，制冷，交通，钢铁，食品，饮料，船舶，制冷等行业

Applicable to cementwood,stone,rubber,petroleumchemical, power generation