AB 1756-L73 B programmable controller

AB 1756-L73 B programmable controller

Technical data of product parameters

The1756-L73 value for the Servo Driver module is selected in the I/O Builder Servo
Driver configuration dialog box (described in “Ovation I/O Builder User’s Guide”
(U3-1044) or “Ovation Developer Studio” (N T-0060 or W IN60). Make sure this
time period value is greater than the value of the Control Task time period that
defines the points associated with this module.
Bits 2, 3, and 4 of the configuration register (register D) determine the length of a 1756-L73
watchdog timer. The 3-bit codes and associated times are standard for Ovation I/O.
Initially, the timer is set to the maximum time, which is 16 seconds. The
microcontroller periodically reads the configuration register and determines the
timeout time.
If the timer expires, the Internal Error LED bit is set, and the LED is turned on. The 1756-L73
Communications OK LED is extinguished. As long as the timer is not expired, the
Communications OK LED is illuminated and the Internal Error LED bit is clearedConfiguration constants can be entered through the local serial port or through the
indirectly addressed shared memory on the Controller’s serial interface bus. A list
of commands is provided in Table 22-7.
The indirectly addressed memory consists of two 64-word buffers; one for received
data, and another for transmitted data.
Buffer access control is done using a control/status bit pair in register E for each of 1756-L73
the two buffers. One bit is written by the Controller, and the other is written by the
Servo Driver. When the two bits are equal, the buffer is not busy and data can be
written into the buffer. When the bits are different, a transfer is in progress and no
data modification should occur from either the Controller or the Servo Driver side.

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