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Question
ZEN Programmable Relays: What Memory Cassettes are compatible with what CPU Unit versions?
Answer
Memory Cassette Compatibility with CPU Unit Versions
Be aware of the following restrictions when using a Memory Cassette containing a program that was stored from a CPU Unit with a different version of the system software.
| Version of CPU Unit used to write the Memory Cassette | Version of CPU Unit used to read the Memory Cassette | ||||||
| Ver. 1.0 | Ver. 1.1 | Ver. 2.0 (V1 CPU Units) | Ver. 3.0 (V2 CPU Units) | ||||
| 10 I/O points | 20 I/O points | 10 I/O points | 20 I/O points | ||||
| Ver. 1.0 | OK | OK | OK | OK | OK | OK | |
| Ver. 1.1 | Restrictions *1 | OK | OK | OK | OK | OK | |
| Ver. 2.0 (V1 CPU Units) | 10 I/O points | Restrictions *1 *2 | Restrictions *2 | OK | OK | OK | OK |
| 20 I/O points | Restrictions *1 *2 *3 | Restrictions *2 *3 | Restrictions *3 | OK | Restrictions *3 | OK | |
| Ver. 3.0 (V2 CPU Units) | 10 I/O points | Restrictions *1 *2 *4 | Restrictions *2 *4 | Restrictions *4 | Restrictions *4 | OK | OK |
| 20 I/O points | Restrictions *1 *4 | Restrictions *2 *3 *4 | Restrictions *4 | Restrictions *4 | Restrictions *3 | OK | |
*1.The display functions (display clear: -CD[] and day/month display: DAT1) cannot be used and will be ignored.
*2.Only the memory area ranges supported by the pre-V1 CPU Units can be used for Timers, Holding Timers, Counters, Weekly Timers, Calendar Timers, and Displays (i.e., only half of each).
*3.Only 6 inputs and 4 outputs can be used in the CPU Unit I/O bits.
Any others will be ignored.
*4.Twin timer operation for timers, operation between days and pulse operation for weekly timers, the 8-digit counter, and 8-digit comparators cannot be used. New Zealand and Australia cannot be set for Daylight Saving Time (DST).
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