Brand/ Manufacturer:
Dimensions:
26 x 16x 20cmWeight:
2 kgCountry of Origin: :
United StatesDescription:
12 channel RTD scanners
Mfr. Part Number: |
857-RAA-001561 |
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Manufacturer: |
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Description: |
The Allen-Bradle 857-RAA and 857-RAD are both 12 channel RTD scanners
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Full Description: |
The 857-RAA RTD scanner module is connected to the Bulletin 857 relay using one fiber optic cable interface module (VCM RTD) |
plcsale@mooreplc.com + 86 18030235313 dddemi33 2851195473
About 857-RAA-001561
The ™ Bulletin 857-RAA and 857-RAD are both 12 channelRTD scanners. The 857-RAD enhanced scanner also provides support for aPTC (thermistor) input along with four programmable 0…25 mA currentinput channels and four programmable 0…25 mA current output channels thatcan be programmed for any analog scale (for example, 0…1mA, 4…20mA,1…5mA, and so on). Both the 857-RAA and 857-RAD are connected to the
Bulletin 857 relay via ST-type glass fiber optic cables; the 857-RAA uses onefiber optic cable (only TX) while the 857-RAD uses a dual fiber optic cableconfiguration (TX and RX).The RTD scanners can also be mounted remotely up to 2000 m from the base 857 relay
The 857-RAA RTD scanner module is connected to the Bulletin 857 relayusing one fiber optic cable interface module (VCM RTD). there are nohardware settings required on the 857-RAA RTD scanner module.
The 857-RAD enhanced RTD scanner communicates to the base relay using a Modbus protocol over dual fiber optic cables. The address of the module must be set with the DIP switches on the side of the device. The available address range is 1…247. See the side and top of the 837-RAD enclosure for switch position (Figure 3). The baud rate is fixed at 9600 bps, with even parity If an RTD sensor is disconnected (open circuited) a value of -200 ºC is
returned for the respective sensor channel. As well, a status indicator called ‘Ext. Al disconnected’ will be enabled within the Output Matrix of the base 857 relay. If an RTD sensor is short circuited, a value of -250 ºC is returned for the respective sensor channel. A status indicator called ‘Ext. Al short circuit’ will be enabled within the Output Matrix of the base 857 relay. If power is lost to the 857-RAA or if communications between the base relay and the 857-RAA are lost:
• Each sensor channel displays a value of -250 ºC.
• There are two status indicators within the Output Matrix to provide feedback on the communication link status to the RTD scanner. ‘REMOTE Comm.’ which is activated when the communication link to the 857-RAA is active or ‘REMOTE Comm Inactive’.
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