Prosafe 功能块说明.ppt

Prosafe_功能块说明7. 现场线路诊断_功能块说明_Lock功能_维护
模件断线诊断(Normally Open)
DI Module
DC Out(24V)
IN
Field Power
Sensor Switch
DI Module
IN
Field Power
Sensor Switch
Sensor Switch为OFF状态与断线状态很难区别.
(OFF状态与断線状态的电阻都是无限大.)↓
就是Switch为ON状态也很难识别.
Field wiring adapter
通过安装Field Wiring (Open Circuit=Yes),可识别正常的OFF状态和断线状态.
:
Ron(1kΩ)<LOOP电阻<Roff(36kΩ)
断線时:
Roff(36KΩ)<LOOP电阻
正常ON时:
LOOP电阻<Ron(1KΩ)
Wire open
SW OFF (Open)
Wire open
()
24VDC
24VDC
DC Out(24V)
COM
COM
2
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模件短絡診断(Normally Close)
DI Module
24VDC
IN
Field Power
Sensor Switch
DI Module
IN
Field Power
Sensor Switch
短路时好像与Sensor .
正常ON時:
Vin = 24V
短絡時:
Vin = 24V
就是Sensor Switch为OFF状态也很难识别.
Field wiring adapter
通过安装Field Wiring Adapter监视输入电压,([Detect Short Circuit]=ON)可识别正常的ON状态和短路状态.
正常ON時:
Vin = 24V – Voffset
短絡時:
Vin = 24V
SW ON (Close)
Wire short
Offset voltage
Wire short
负载
DC Out(24V)
COM
24VDC
DC Out(24V)
COM
3
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输出粘住诊断(Normally Energized-1 DTS for ESD)
DO Module
OUT(24V)
Field Power
COM
DC+
DC-
Field Equipment
如果输出ON粘住,当需要时就不能切断现场设备.
DO模件通过(Pulse Test(OFF)设定为Yes)测试它的输出开关,如果输出开关不能为OFF,,如果需要切断输出,则操作输出切断开关使输出切断.
Output
Control
Monitor Circuit
这个保险丝对8个通道是共用的,用户不能更换(15A)
4
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模件短路诊断(Normally Energized-2 DTS)
DO Module
OUT
Field Power
Wire short
Output
Control
COM
DC+
DC-
Field Equipment
Monitor Circuit
DO输出通常为ON(DTS)时,输出连线与电源线短路,此时DO输出OFF非励磁,也不能切断现场设备!
DO模件监视LOOP电阻,如果超出正常范围就可判断状态异常,并向CPU模件发出故障报警(在I/O Parameter Builder将Detect Disconnection设定为Yes).
正常範囲: 40Ω<LOOP电阻<680Ω
负载
5
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断線診断(Normally De-Energized-1)
DO Module
OUT
Field Power
Wire open
Output
Control
COM
DC+
DC-
Field Equipment
Monitor Circuit
输出通常为OFF时(ETS),输出连线如果断线,当DO输出ON时,现场设备也不能为ON!
↓
DO模件时常监视Loop电阻,超过正常范围时,就可判断出断线,向CPU模件发出故障报警(Detect Disconnection设定为Yes).
正常范围: 40Ω<Loop电阻<680Ω
6
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