HONEYWELL TK-PRR021工控模塊,TK-PRR021中文PDF使用手冊
在將其與其中一個基板一起使用之前。定制Y形電纜應使用圖10-20建造基板。遠程基板IC693CHS393F（及更高版本）和IC693CHS399E（及更高版本）具有更換底板內部，從而無需從配合件上拆下銷1纜繩當將工廠制造的Y形電纜與這些基板一起使用時，無需從電纜上拆下針腳1。可以為這些基板定制Y形電纜使用圖10-20或圖10-21。圖10-21顯示了標準（工廠制造）制造Y形電纜。通過移除為早期版本的remote定制的Y形電纜中的針腳1基板，引腳7（0V）信號參考源于主（CPU）基板。
HONEYWELL TK-PRR021工控模塊在里面在這些早期版本的遠程基板上，插腳1與插腳7（0V）相連，還與交流電源相連耦合到遠程機架接地。當將這些基板與100%屏蔽Y形電纜的引腳7（0V）參考將不正確地進行直流耦合通過D-超小型連接器外殼（直流）連接至遠程機架接地耦合到遠程機架接地。在遠程基板IC693CHS393F（及更高版本）和IC693CHS399E（及更高版本）中引腳1屏蔽信號直流耦合至遠程機架接地，不連接至引腳7（0V）。這通過提供良好的連續電纜屏蔽來實現最佳抗噪性，并且仍然允許引腳7（0V）信號參考源于CPU基板，而無需需要拆除任何工廠或定制電纜中的針腳1。D超小型連接器外殼仍然直流耦合到遠程機架接地。
baseplate before using it with one of these baseplates. Custom built Wye cables for these
baseplates should be built using Figure 10-20.
Remote baseplates IC693CHS393F (and later) and IC693CHS399E (and later) have a
change inside the baseplate which eliminates the need to remove pin 1 from the mating
cable. When using factory made Wye cable with these baseplates, it is not necessary to
remove pin 1 from the cable. Custom built Wye cables for these baseplates can be made
using either Figure 10-20 or Figure 10-21. Figure 10-21 shows how the standard (factory
made) Wye cables are made.
By removing pin 1 in custom built Wye cables made for the earlier versions of remote
baseplates, the pin 7 (0V) signal reference originates in the main (CPU) baseplate. In
these earlier versions of the remote baseplates, pin 1 was tied to pin 7 (0V) and also AC
coupled to the remote frame ground. When using these baseplates in combination with
the 100% shielded Wye cables, the pin 7 (0V) reference would be improperly DC coupled
to the remote frame ground through the D-subminiature connector shell, which is DC
coupled to the remote frame ground.
In the remote baseplates IC693CHS393F (and later) and IC693CHS399E (and later), the
pin 1 shield signal is DC coupled to the remote frame ground and not attached to pin 7
(0V). This allows the best noise immunity by providing a good continuous cable shield,
and still allows the pin 7 (0V) signal reference to originate in the CPU baseplate without
the need for removing pin 1 in any factory or custom built cable. The D-subminiature
connector shell is still DC coupled to the remote frame ground.
