PMAC/PMAC2 V1.17C Addendum I68 Alternate TWS Input Format [New] Range: 0 – 1 Units: none Default: 0 I68 controls how the PMAC interprets incoming data on a TWS-format M-variable read from an ACC-34 or similar serial-interface I/O board. If I68 is set to the default value of 0, PMAC expects the serial input data on the DAT0 signal line. If I68 is set to 1, PMAC expects the serial input data on the DAT7 signal line. The DAT7 line is separated more from the output clock line on the same cable; the use of DAT7 by setting I68 to 1 and making the appropriate jumper setting on the I/O board makes it possible to use a longer cable without too much coupling interference between signals.
On the ACC-34AA, jumper E23 must be connect pins 1 and 2 to support the default setting of I68 = 0; it must connect pins 2 and 3 to support the setting of I68 = 1. On the ACC-76 and ACC-77 “P-Brain” boards, jumper E1 should be ON to support the default setting of I68 = 0; jumper E8 should be ON to support the setting of I68 = 1. Older boards of this class do not support settings of I68 = 1. I69 Modbus TCP Software Control Panel Start Address [New] Range: $0 – $FFFF Units: PMAC addresses Default: 0 I69 enables and specifies the address of the start of the Modbus TCP software control panel in PMAC.
I69 permits a software control panel to be commanded over the Modbus TCP link, typically from a PLC, using part of the user buffer created with the DEFINE UBUFFER command and reserved for Modbus TCP use with I67. If I69 is set to a value greater than 0, this software control panel is enabled. Typically, I69 is set to a value 128 ($80) greater than the value of I67, so this control panel starts at an address 128 higher than the beginning of the entire Modbus TCP buffer. For example, if the beginning of the Modbus buffer were at $9F00, I69 could be set to $9F80. The software control panel occupies 18 long words of PMAC memory.
The structure functions of the Modbus panel are equivalent to those for the DPRAM software control panel, which are documented in the Memory and I/O Map chapter of the Software Reference Manual at their default addresses of $D000 - $D011. The operation of the Modbus control panel is independent of that for the DPRAM control panel (which is controlled by I2). One, neither, or both of these control panels may be active at one time. 2 V1.17C Firmware Version