S7-1500 Special module
![](https://spsepahan.com/wp-content/uploads/2024/03/P_ST70_XX_06277P.png)
6ES7550-1AA00-0AB0
SIMATIC S7-1500, TM count 2x24V Counter module, 2 channels for
24 V incremental or encoder 3 DI, 2 DQ per channel
![](https://spsepahan.com/wp-content/uploads/2024/03/P_ST70_XX_06277P.png)
6ES7551-1AB00-0AB0
SIMATIC S7-1500, TM POSINPUT 2 Counter and position detection
module for RS422 incremental encoder or SSI absolute value
encoder, 2 channels, 2 DI, 2 DQ per channel
![](https://spsepahan.com/wp-content/uploads/2024/03/P_ST70_XX_06277P.png)
6ES7552-1AA00-0AB0
SIMATIC S7-1500, TM Timer DIDQ 16x 24 V time-controlled digital
inputs and outputs max. 8 DI, 16 DQ of which max. 16 with time
stamp, Count, PWM, oversampling