Summary of Contents for Allen-Bradley 1770-LDA
- Page 2 Your line driver/receiver consists of: a two-slot chassis with two integral 1770-P1 power supplies two Line Driver Receiver Modules (cat. no. 1772-DR) two Connectors (cat. no. 1770-XE) The two-slot chassis assembly (figure 1) consists of: card guides, card edge connectors, and locking tabs to support two line driver/receiver modules two integral power supplies a terminal strip for connection of incoming 120 or 220/240V fused AC...
- Page 4 The line driver/receiver module is a plug-in module that mounts in one slot of the two-slot chassis. Card guides on the top and bottom of the rack and locking tabs at the front hold the module securely. The module’s edge connector receives DC operating voltage from an integral power supply.
- Page 5 (figure 4). One data link handles communications while the other provides handshaking for communications integrity. Allen-Bradley recommends dual full duplex configuration to ensure communication integrity between the PLC-2 family processor and the industrial terminal. Communication integrity is essential if forcing functions are entered through the industrial terminal and are not cleared from the terminal before it is turned off.
- Page 6 WARNING: Do not apply power to the power supplies until after the installation is complete and checked. When installation is complete and checked, apply power to the power supplies only in accordance with the power-up procedure given in the section following this installation procedure. Failure to observe this warning might result in injury to personnel and damage to equipment.
- Page 7 Step 1 – Position jumper for appropriate AC input voltage (120V or 220/240V AC). Step 2 – Connect AC input lines to terminals L1 and L2. Step 3 – Connect equipment grounding conductor to ground terminal. Step 4 – Connect the PLC-2 family processor to the two line drivers B (female) connectors using a 1770-CW1 interconnect cable.
- Page 8 Step 5 – Connect the industrial terminal Channel A PLC-2 family connector to the two line drivers B (female) connectors using a 1770-CW2 interconnect cable. Attach cables so that stress is relieved at the connector hoods. Refer to figure 8.
- Page 9 Step 6 – Connect the line drivers, A (male) connectors using two 1778-CR I/O interconnect cables or Belden 8723 (maximum length 5000 feet) and four, 15-pin 1770-XE connectors. Refer to figures and 9. Step 7 – Check all cable wiring against the above steps and figures 4, 7, 8, and 9.
- Page 10 After you complete and check the two data link installations, apply power to the system by performing the following steps. This sequence is necessary to properly establish communication between the processor and industrial terminal. Step 1 – Energize the two line driver/receiver power supplies associated with the PLC-2 family processor.
- Page 11 Check that power supply DC voltages are present on module receptacle pins. Check that line driver/receiver front panel LED indicator is on. Indicator goes out if the remote I/O interconnect cable opens or if the far end line driver/receiver loses its operating voltages. Check for an open remote I/O interconnect cable or shorted cable.
- Page 12 As a subsidiary of Rockwell International, one of the world’s largest technology companies — Allen-Bradley meets today’s challenges of industrial automation with over 85 years of practical plant-floor experience. More than 11,000 employees throughout the world design, manufacture and apply a wide range of control and automation products and supporting services to help our customers continuously improve quality, productivity and time to market.