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PLC
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Please find below a list of frequently asked questions (FAQs) with regards to PLC. More extensive FAQs can be found at the Rockwell Automation Knowledgebase.
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| A. As many as eight 1769 modules can be attached to the right of the 1768 system.
The 1769 I/O connected directly to the 1768 backplane does not need a 1769 power supply. Never put a 1769 power supply in the 1768 system. Putting a 1769 power supply in the 1768 system causes the controller to generate a major fault that cannot be cleared until you remove the 1769 power supply.
Additional 1769 modules must be in additional I/O banks each additional I/O bank must have its own 1769 power supply. |
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| A. Yes, the controllers with 24V DC inputs support one high speed counter at 20 kHz with eight modes of operation, including quandrature for encoder input. These same inputs can be used as pulse catch (latching) inputs. Controllers with 24V DC outputs support one PTO/PWM output at 20 kHz for stepper/servo control.
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| A. The Channel 1 supports EtherNet/IP for peer-to-peer messaging and an embedded Web server. Email is supported with Series B controllers. |
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| A. Execution time for a typical 500- instruction program is only 1.5 ms. |
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| A. The MicroLogix 1000 is ideal for tight applications where other alternatives won’t fit. The 16 I/O DC-powered unit, for example, is one of the smallest micros around – only 120 x 80 x 40 mm (4.72 x 3.15 x 1.57 in.). |
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| A. The built-in Channel 0 RS-232-C port supports DF1 full-duplex, DF1 half-duplex master and slave, DH-485, Modbus RTU master and slave, reportby-exception, and peer-to-peer data exchange; and DF1 Radio Modem. You can connect the MicroLogix 1200 controller to DH-485, DeviceNet, or EtherNet/IP networks through optional communication interface modules. MicroLogix 1200R controllers have an additional Programming/ HMI port. |
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| A. Send bits, integers and string data to the display; allow bit and integer information to be input from the display to the control program; set up custom start-up screen; monitor controller functions; operate two digital trim pots. |
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| A. DeviceNet via 1761-NET-DNI, DH485 via 1761-NET-AIC, DF1 Full-Duplex, DF1Half-Duplex Slave. |
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| A. The MicroLogix 1000 line offers 17 variations (14 discrete models with 10-, 16-, and 32-point configurations and three analog models with five analog and 20 discrete I/O points). |
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| A. Ten digital inputs, two analog voltage inputs, and six digital outputs with expansion of up to four 1762 I/O modules to support applications up to 80 points. |
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| A. 24-point or 40-point controllers are available, with expansion of up to six additional 1762 I/O modules (must stay within controller’s current and power budgets).
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| A. Follow these guidelines as you place modules in the 1768 backplane.
- The 1768 power supply must be the leftmost module in the 1768 backplane.
- The controller must be the rightmost module in the 1768 backplane. |
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| A. The controller and I/O modules can be placed to the left and the right of the power supply. As many as eight modules can be placed on each side of the power supply. The CompactLogix controller has a power supply distance rating of 4 modules. The controller must be the leftmost module in the first bank of the system. The maximum configuration for the first bank of a CompactLogix controller is the controller and 3 I/O modules to the left of the power supply and 8 I/O modules to the right of the power supply. |
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| A. The MicroLogix 1100 supports real online editing (not just holding the outputs in their last state and downloading a new program). This allows you to make changes to an operating during run, including PID loops.
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