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ET1100 bảng dữ liệu(PDF) 36 Page - Beckhoff Automation GmbH & Co. KG |
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ET1100 bảng dữ liệu(HTML) 36 Page - Beckhoff Automation GmbH & Co. KG |
36 / 124 page Pin Description III-22 Slave Controller – ET1100 Hardware Description 3.6 Configuration Pins The configuration pins are used to configure the ET1100 at power-on with pull-up or pull-down resistors. At power-on the ET1100 uses these pins as inputs to latch the configuration2. After power- on, the pins have their operation functionality which has been assigned to them, and therefore pin direction changes if necessary. The power-on phase finishes before the nRESET pin is released. In subsequent reset phases without power-on condition, the configuration pins still have their operation functionality, i.e., the ET1100 configuration is not latched again and output drivers remain active. The configuration value 0 is realized by a pull-down resistor, a pull-up resistor is used for a 1. Since some configuration pins are also used as LED outputs, the polarity of the LED output depends on the configuration value. 3.6.1 Example schematics for configuration input/LED output pins VCC I/O Pull-Up Pull-Down Pin Pin Figure 9: Dual purpose configuration input/LED output pins 2 Take care of proper configuration: External devices attached to dual-purpose configuration pins might interfere sampling the intended configuration if they are e.g. not properly powered at the sample time (external device keeps configuration pin low although a pull-up resistor is attached). In such cases the ET1100 power-on value sampling time can be delayed by delaying power activation. |
Số phần tương tự - ET1100 |
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Mô tả tương tự - ET1100 |
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