The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

HONEYWELL CC-PCF901 Firewall module

prevent the controllers from receiving erroneous data from a faulty input module. Three analog input modules can be connected in parallel to obtain fault tolerant input sensing. In this triple module configuration, a failed module can be removed and replaced without interrupting the input signals.Analog field signals are conditioned and multiplexed into an analog-to-digital (A to D) converter and converted into 12-bit digital data. These digital values are stored in the module’s RAM. The digital logic circuits are optically isolated from the analog field signals to protect the logic circuits from external field signal transients and over voltages.The processor modules send triplicated read data requests to the analog input module over the I/O Safetybus. The processors’ addressing data and data read requests are voted by the module (preventing I/O Safetybus failures upstream from the module from affecting module operations). The voted result is then passed to the I/O bus interface logic. After receiving the voted data read request, the I/O bus interface logic retrieves the analog data values from the RAM and places the data into the module’s three bus drivers. Each of the three bus drivers is independently powered and controlled (by the I/O transceiver modules) — preventing failures in a single driver from propagating to the other two /O busses. The bus drivers then transmit the data via the backplane I/O Safetybus to the I/O transceiver modules which, in turn, transmit the data to the processors. The 12-bit analog input data is packaged as a 16-bit integer. In this format the analog data is the least significant bits, providing analog input data ranging from 0 to 4095. Two of the remaining four bits are used to flag alarms as shown in Figure 2.

Analog Input Modules

 Analog input modules provide data input for a maximum of 16 field analog signals per module. Two types of modules are available: one for high noise immunity (60 Hz rejection) and one with low noise immunity (fast response). Features · Sixteen single-ended or eight differential voltage inputs. Interface to current inputs using external 250 ohm resistors for current to voltage conversion (resistors are provided as part of the analog input termination blocks, catalog number T3325- XX). · Fault tolerant operation when connected in parallel with redundant modules of the same type. · Hot replaceable. · Jumper-selectable input ranges. · 12-bit analog to digital resolution (1 part in 4096). · Sample rate of all channels in 1.8 msec (differential) or 3.6 msec (single-ended). · 60 Hz rejection (T3420A) and fast response (T3420AF) versions available. · 2500 volt isolation between analog and digital logic circuits. · Individual front panel indicators on each module show module active and fault status. · TÜV certified for safety, Risk Class 5. Each module’s triplicated I/O Safetybus interface ensures that no failure in the module can affect the operation of the Regent system or other I/O modules in the system. Extensive fault detection and annunciation of critical redundant circuits help