Siemens electronic blocks and terminal blocks et 200l series siemens 6es7193 1ch10 0xa0 p the siemens 6es7193 1ch10 0xa0 is a 16 channel imatic dp tb16l terminal block from the et 200l series the terminal block accommodates the electronic block it carries the wiring so that no cables need to be unplugged when the electronic block is replaced the terminal blocks have a 2 wire connection system as standard as an option additional terminals can be clipped on to enable a 3 wire or 4 wire