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3BSE042244R1觸摸顯示屏
屏蔽手持終端被設(shè)計(jì)用于工業(yè)應(yīng)用。在這種環(huán)境中，可能會(huì)出現(xiàn)相當(dāng)大的電磁和靜電干擾。由于這個(gè)原因，
在以下情況下，特別重視抗干擾性和數(shù)據(jù)安全性：構(gòu)建了裝置。
涂層HT外殼保護(hù)敏感電子設(shè)備免受電磁干擾干擾。
由于其特殊結(jié)構(gòu)，HT電纜可確?？垢蓴_性電纜長(zhǎng)度較大的情況。
一、 e.數(shù)據(jù)線（通信信號(hào)）與HT中的控制線路（電源、啟用開關(guān)、急停、鑰匙開關(guān)等）纜繩
信號(hào)名稱以及數(shù)據(jù)線和控制線的連接如中所述“基本接線圖”一章。輸入電源線的濾波。
正常情況下，控制柜內(nèi)的電源線不屏蔽。因此它們必須在HT電纜屏蔽外部布線，以避免敏感數(shù)據(jù)線
受到其他線路（例如電源線）的干擾。
4.1屏蔽連接
HT電纜的電纜屏蔽可被視為HT屏蔽外殼的延伸，以：通信伙伴的屏蔽外殼（例如：PLC）。就這樣，盾牌
電纜屏蔽與設(shè)備屏蔽的連接基本上有助于：抗HT干擾。屏蔽不需要接地連接。
對(duì)于HT中的屏蔽連接，連接板上的電纜夾為：
習(xí)慣于在PLC連接器和適配器插頭處，將屏蔽直接連接到連接器外殼：金屬化D-SUB連接器外殼將屏蔽直接連接到連接器外殼
使用電纜夾
連接器外殼中的正確屏蔽連接（如PLC連接器或適配器插頭）
將屏蔽連接到引腳或端子的清管器不適用。這樣的感應(yīng)性
豬尾表示高頻干擾的高歐姆電阻。這似乎中斷電纜屏蔽。在這種情況下，干擾不再被吸收，而是直接被吸收
影響內(nèi)線。屏蔽連接只能通過適當(dāng)?shù)倪B接器實(shí)現(xiàn)表面接觸面積。
帶有電纜夾的屏蔽連接會(huì)影響屏蔽阻尼。然而，阻尼可能對(duì)于在工業(yè)環(huán)境中出現(xiàn)的干擾信號(hào)仍然足夠。
在任何情況下，都應(yīng)避免通過清管器尾部進(jìn)行屏蔽連接。在這種情況下，屏蔽阻尼HT電纜將減少到不足值。
Shielding
The handheld terminal is conceived for industrial applications. In this environment,
considerable electromagnetic and electrostatic interferences may occur. For this reason,
particular importance was attached to immunity to interferences and data security when the
device was constructed.
The coated HT housing protects the sensitive electronics against electromagnetic
interferences.
Due to its special construction, the HT cable ensures immunity to interferences in
case of larger cable lengths.
I.e. the data lines (communication signals) are shielded and routed separately from
the control lines (power supply, enabling switch, E-stop, key switch, etc.) in the HT
cable.
The signal designations and the connection of data and control lines are described in
the chapter ?Basic Wiring Diagram“.
Filtering of incoming power supply lines.
Normally the power supply lines in the control cabinet are not shielded. Therefore
they must be routed outside the HT cable shield to avoid that the sensitive data lines
are disturbed by the other lines (e.g. power supply lines).
4.1 Shield Connections
The cable shield of the HT cable can be considered as extension of the HT shield housing to
the shield housing of the communication partner (e.g.: PLC). In this way the shield
connections of the cable shield to the shields of the devices essentially contribute to the
immunity to interferences of the HT. Connections to ground are not required for shield
connections.
For the shield connection in the HT the cable clamp on the connection board is
used.At the PLC connector and in case of adapter plugs, connect the shield directly to the
connector housing:
Metallized D-SUB connector housing
Connect shield directly to connector housing
using the cable clip
Correct shield connection in connector housing (e.g. PLC connector or adapter plug)
Pig tails to connect the shield to the pins or terminals are not suitable. The inductivity of such
pig tails represents a high-ohmic resistance for high-frequency interferences. This seems to
interrupt the cable shield. In this case interferences are not absorbed any more but directly
affect the inner lines.Shield connections should only be realised with appropriate connectors enabling a large
surface contact area.
Shield connections with cable clamps affect the shield damping. However the damping might
still be sufficient for interference signals occurring in the industrial environment.
In all circumstances, avoid a shield connection via pig tails. In this case the shield damping of
the HT cable would be reduced to insufficient values.
